sed -i '\,2/extern.h,d'

author: 卜部昌平 <shyouhei@ruby-lang.org> 2020-07-21 15:35:26 +0900
committer: 卜部昌平 <shyouhei@ruby-lang.org> 2020-08-27 14:07:49 +0900
commit: 0da2a3f1fc22da47cdce3cbcd8031d609ba8f207 (patch)
tree: 4c6169693f1582bf6f8563419aec9e6aea1c7a70
parent: b2e1688e7d44d45e772ac9d5e79f4ad6e70141d5 (diff)
89 files changed, 0 insertions, 332 deletions
diff --git a/common.mk b/common.mk
index be2f643ec3..335a56f8e9 100644
--- a/common.mk
+++ b/common.mk
@@ -1615,7 +1615,6 @@ addr2line.$(OBJEXT): {$(VPATH)}assert.h
 addr2line.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 addr2line.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 addr2line.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-addr2line.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 addr2line.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 addr2line.$(OBJEXT): {$(VPATH)}backward/2/long_long.h
 addr2line.$(OBJEXT): {$(VPATH)}backward/2/stdalign.h
@@ -1692,7 +1691,6 @@ array.$(OBJEXT): {$(VPATH)}assert.h
 array.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 array.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 array.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-array.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 array.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 array.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 array.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -1882,7 +1880,6 @@ ast.$(OBJEXT): {$(VPATH)}ast.rbinc
 ast.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 ast.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 ast.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-ast.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 ast.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 ast.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 ast.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -2075,7 +2072,6 @@ bignum.$(OBJEXT): {$(VPATH)}assert.h
 bignum.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 bignum.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 bignum.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-bignum.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 bignum.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 bignum.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 bignum.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -2256,7 +2252,6 @@ builtin.$(OBJEXT): {$(VPATH)}assert.h
 builtin.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 builtin.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 builtin.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-builtin.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 builtin.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 builtin.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 builtin.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -2450,7 +2445,6 @@ class.$(OBJEXT): {$(VPATH)}assert.h
 class.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 class.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 class.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-class.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 class.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 class.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 class.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -2634,7 +2628,6 @@ compar.$(OBJEXT): {$(VPATH)}assert.h
 compar.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 compar.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 compar.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-compar.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 compar.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 compar.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 compar.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -2829,7 +2822,6 @@ compile.$(OBJEXT): {$(VPATH)}assert.h
 compile.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 compile.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 compile.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-compile.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 compile.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 compile.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 compile.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -3041,7 +3033,6 @@ complex.$(OBJEXT): {$(VPATH)}assert.h
 complex.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 complex.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 complex.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-complex.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 complex.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 complex.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 complex.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -3226,7 +3217,6 @@ cont.$(OBJEXT): {$(VPATH)}assert.h
 cont.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 cont.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 cont.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-cont.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 cont.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 cont.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 cont.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -3417,7 +3407,6 @@ debug.$(OBJEXT): {$(VPATH)}assert.h
 debug.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 debug.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 debug.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-debug.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 debug.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 debug.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 debug.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -3600,7 +3589,6 @@ debug_counter.$(OBJEXT): {$(VPATH)}assert.h
 debug_counter.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 debug_counter.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 debug_counter.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-debug_counter.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 debug_counter.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 debug_counter.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 debug_counter.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -3777,7 +3765,6 @@ dir.$(OBJEXT): {$(VPATH)}assert.h
 dir.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 dir.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 dir.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-dir.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 dir.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 dir.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 dir.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -3952,7 +3939,6 @@ dln.$(OBJEXT): {$(VPATH)}assert.h
 dln.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 dln.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 dln.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-dln.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 dln.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 dln.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 dln.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -4115,7 +4101,6 @@ dln_find.$(OBJEXT): {$(VPATH)}assert.h
 dln_find.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 dln_find.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 dln_find.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-dln_find.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 dln_find.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 dln_find.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 dln_find.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -4277,7 +4262,6 @@ dmydln.$(OBJEXT): {$(VPATH)}assert.h
 dmydln.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 dmydln.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 dmydln.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-dmydln.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 dmydln.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 dmydln.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 dmydln.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -4493,7 +4477,6 @@ encoding.$(OBJEXT): {$(VPATH)}assert.h
 encoding.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 encoding.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 encoding.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-encoding.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 encoding.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 encoding.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 encoding.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -4683,7 +4666,6 @@ enum.$(OBJEXT): {$(VPATH)}assert.h
 enum.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 enum.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 enum.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-enum.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 enum.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 enum.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 enum.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -4872,7 +4854,6 @@ enumerator.$(OBJEXT): {$(VPATH)}assert.h
 enumerator.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 enumerator.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 enumerator.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-enumerator.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 enumerator.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 enumerator.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 enumerator.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -5061,7 +5042,6 @@ error.$(OBJEXT): {$(VPATH)}assert.h
 error.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 error.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 error.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-error.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 error.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 error.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 error.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -5265,7 +5245,6 @@ eval.$(OBJEXT): {$(VPATH)}assert.h
 eval.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 eval.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 eval.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-eval.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 eval.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 eval.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 eval.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -5485,7 +5464,6 @@ file.$(OBJEXT): {$(VPATH)}assert.h
 file.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 file.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 file.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-file.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 file.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 file.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 file.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -5690,7 +5668,6 @@ gc.$(OBJEXT): {$(VPATH)}assert.h
 gc.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 gc.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 gc.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-gc.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 gc.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 gc.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 gc.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -5899,7 +5876,6 @@ golf_prelude.$(OBJEXT): {$(VPATH)}assert.h
 golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 golf_prelude.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -6074,7 +6050,6 @@ goruby.$(OBJEXT): {$(VPATH)}backward.h
 goruby.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 goruby.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 goruby.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-goruby.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 goruby.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 goruby.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 goruby.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -6257,7 +6232,6 @@ hash.$(OBJEXT): {$(VPATH)}assert.h
 hash.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 hash.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 hash.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-hash.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 hash.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 hash.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 hash.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -6435,7 +6409,6 @@ inits.$(OBJEXT): {$(VPATH)}assert.h
 inits.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 inits.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 inits.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-inits.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 inits.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 inits.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 inits.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -6627,7 +6600,6 @@ io.$(OBJEXT): {$(VPATH)}assert.h
 io.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 io.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 io.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-io.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 io.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 io.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 io.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -6834,7 +6806,6 @@ iseq.$(OBJEXT): {$(VPATH)}assert.h
 iseq.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 iseq.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 iseq.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-iseq.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 iseq.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 iseq.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 iseq.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -7043,7 +7014,6 @@ load.$(OBJEXT): {$(VPATH)}assert.h
 load.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 load.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 load.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-load.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 load.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 load.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 load.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -7227,7 +7197,6 @@ loadpath.$(OBJEXT): {$(VPATH)}assert.h
 loadpath.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 loadpath.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 loadpath.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-loadpath.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 loadpath.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 loadpath.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 loadpath.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -7390,7 +7359,6 @@ localeinit.$(OBJEXT): {$(VPATH)}assert.h
 localeinit.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 localeinit.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 localeinit.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-localeinit.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 localeinit.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 localeinit.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 localeinit.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -7558,7 +7526,6 @@ main.$(OBJEXT): {$(VPATH)}backward.h
 main.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 main.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 main.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-main.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 main.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 main.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 main.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -7738,7 +7705,6 @@ marshal.$(OBJEXT): {$(VPATH)}assert.h
 marshal.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 marshal.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 marshal.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-marshal.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 marshal.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 marshal.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 marshal.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -7918,7 +7884,6 @@ math.$(OBJEXT): {$(VPATH)}assert.h
 math.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 math.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 math.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-math.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 math.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 math.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 math.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -8096,7 +8061,6 @@ miniinit.$(OBJEXT): {$(VPATH)}ast.rb
 miniinit.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 miniinit.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 miniinit.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-miniinit.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 miniinit.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 miniinit.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 miniinit.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -8334,7 +8298,6 @@ mjit.$(OBJEXT): {$(VPATH)}assert.h
 mjit.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 mjit.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 mjit.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-mjit.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 mjit.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 mjit.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 mjit.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -8550,7 +8513,6 @@ mjit_compile.$(OBJEXT): {$(VPATH)}assert.h
 mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 mjit_compile.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -8749,7 +8711,6 @@ node.$(OBJEXT): {$(VPATH)}assert.h
 node.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 node.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 node.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-node.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 node.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 node.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 node.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -8942,7 +8903,6 @@ numeric.$(OBJEXT): {$(VPATH)}assert.h
 numeric.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 numeric.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 numeric.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-numeric.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 numeric.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 numeric.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 numeric.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -9136,7 +9096,6 @@ object.$(OBJEXT): {$(VPATH)}assert.h
 object.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 object.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 object.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-object.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 object.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 object.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 object.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -9320,7 +9279,6 @@ pack.$(OBJEXT): {$(VPATH)}assert.h
 pack.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 pack.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 pack.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-pack.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 pack.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 pack.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 pack.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -9515,7 +9473,6 @@ parse.$(OBJEXT): {$(VPATH)}assert.h
 parse.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 parse.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 parse.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-parse.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 parse.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 parse.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 parse.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -9742,7 +9699,6 @@ proc.$(OBJEXT): {$(VPATH)}assert.h
 proc.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 proc.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 proc.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-proc.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 proc.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 proc.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 proc.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -9945,7 +9901,6 @@ process.$(OBJEXT): {$(VPATH)}assert.h
 process.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 process.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 process.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-process.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 process.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 process.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 process.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -10140,7 +10095,6 @@ random.$(OBJEXT): {$(VPATH)}assert.h
 random.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 random.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 random.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-random.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 random.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 random.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 random.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -10328,7 +10282,6 @@ range.$(OBJEXT): {$(VPATH)}assert.h
 range.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 range.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 range.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-range.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 range.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 range.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 range.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -10512,7 +10465,6 @@ rational.$(OBJEXT): {$(VPATH)}assert.h
 rational.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 rational.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 rational.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-rational.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 rational.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 rational.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 rational.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -10691,7 +10643,6 @@ re.$(OBJEXT): {$(VPATH)}assert.h
 re.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 re.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 re.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-re.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 re.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 re.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 re.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -10863,7 +10814,6 @@ regcomp.$(OBJEXT): {$(VPATH)}assert.h
 regcomp.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 regcomp.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 regcomp.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-regcomp.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 regcomp.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 regcomp.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 regcomp.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -11028,7 +10978,6 @@ regenc.$(OBJEXT): {$(VPATH)}assert.h
 regenc.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 regenc.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 regenc.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-regenc.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 regenc.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 regenc.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 regenc.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -11192,7 +11141,6 @@ regerror.$(OBJEXT): {$(VPATH)}assert.h
 regerror.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 regerror.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 regerror.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-regerror.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 regerror.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 regerror.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 regerror.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -11356,7 +11304,6 @@ regexec.$(OBJEXT): {$(VPATH)}assert.h
 regexec.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 regexec.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 regexec.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-regexec.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 regexec.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 regexec.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 regexec.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -11520,7 +11467,6 @@ regparse.$(OBJEXT): {$(VPATH)}assert.h
 regparse.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 regparse.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 regparse.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-regparse.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 regparse.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 regparse.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 regparse.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -11685,7 +11631,6 @@ regsyntax.$(OBJEXT): {$(VPATH)}assert.h
 regsyntax.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 regsyntax.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 regsyntax.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-regsyntax.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 regsyntax.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 regsyntax.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 regsyntax.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -11888,7 +11833,6 @@ ruby.$(OBJEXT): {$(VPATH)}assert.h
 ruby.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 ruby.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 ruby.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-ruby.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 ruby.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 ruby.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 ruby.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -12072,7 +12016,6 @@ setproctitle.$(OBJEXT): {$(VPATH)}assert.h
 setproctitle.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 setproctitle.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 setproctitle.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-setproctitle.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 setproctitle.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 setproctitle.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 setproctitle.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -12252,7 +12195,6 @@ signal.$(OBJEXT): {$(VPATH)}assert.h
 signal.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 signal.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 signal.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-signal.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 signal.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 signal.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 signal.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -12446,7 +12388,6 @@ sprintf.$(OBJEXT): {$(VPATH)}assert.h
 sprintf.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 sprintf.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 sprintf.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-sprintf.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 sprintf.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 sprintf.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 sprintf.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -12623,7 +12564,6 @@ st.$(OBJEXT): {$(VPATH)}assert.h
 st.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 st.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 st.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-st.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 st.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 st.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 st.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -12792,7 +12732,6 @@ strftime.$(OBJEXT): {$(VPATH)}assert.h
 strftime.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 strftime.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 strftime.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-strftime.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 strftime.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 strftime.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 strftime.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -12980,7 +12919,6 @@ string.$(OBJEXT): {$(VPATH)}assert.h
 string.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 string.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 string.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-string.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 string.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 string.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 string.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -13205,7 +13143,6 @@ struct.$(OBJEXT): {$(VPATH)}assert.h
 struct.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 struct.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 struct.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-struct.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 struct.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 struct.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 struct.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -13395,7 +13332,6 @@ symbol.$(OBJEXT): {$(VPATH)}assert.h
 symbol.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 symbol.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 symbol.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-symbol.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 symbol.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 symbol.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 symbol.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -13593,7 +13529,6 @@ thread.$(OBJEXT): {$(VPATH)}assert.h
 thread.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 thread.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 thread.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-thread.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 thread.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 thread.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 thread.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -13797,7 +13732,6 @@ time.$(OBJEXT): {$(VPATH)}assert.h
 time.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 time.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 time.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-time.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 time.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 time.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 time.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -13978,7 +13912,6 @@ transcode.$(OBJEXT): {$(VPATH)}assert.h
 transcode.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 transcode.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 transcode.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-transcode.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 transcode.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 transcode.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 transcode.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -14155,7 +14088,6 @@ transient_heap.$(OBJEXT): {$(VPATH)}assert.h
 transient_heap.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 transient_heap.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 transient_heap.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-transient_heap.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 transient_heap.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 transient_heap.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 transient_heap.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -14330,7 +14262,6 @@ util.$(OBJEXT): {$(VPATH)}assert.h
 util.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 util.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 util.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-util.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 util.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 util.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 util.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -14517,7 +14448,6 @@ variable.$(OBJEXT): {$(VPATH)}assert.h
 variable.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 variable.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 variable.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-variable.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 variable.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 variable.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 variable.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -14713,7 +14643,6 @@ version.$(OBJEXT): {$(VPATH)}assert.h
 version.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 version.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 version.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-version.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 version.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 version.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 version.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -14920,7 +14849,6 @@ vm.$(OBJEXT): {$(VPATH)}assert.h
 vm.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 vm.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 vm.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-vm.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 vm.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 vm.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 vm.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -15136,7 +15064,6 @@ vm_backtrace.$(OBJEXT): {$(VPATH)}assert.h
 vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 vm_backtrace.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -15328,7 +15255,6 @@ vm_dump.$(OBJEXT): {$(VPATH)}assert.h
 vm_dump.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 vm_dump.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 vm_dump.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-vm_dump.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 vm_dump.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 vm_dump.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 vm_dump.$(OBJEXT): {$(VPATH)}backward/2/limits.h
@@ -15519,7 +15445,6 @@ vm_trace.$(OBJEXT): {$(VPATH)}assert.h
 vm_trace.$(OBJEXT): {$(VPATH)}backward/2/assume.h
 vm_trace.$(OBJEXT): {$(VPATH)}backward/2/attributes.h
 vm_trace.$(OBJEXT): {$(VPATH)}backward/2/bool.h
-vm_trace.$(OBJEXT): {$(VPATH)}backward/2/extern.h
 vm_trace.$(OBJEXT): {$(VPATH)}backward/2/gcc_version_since.h
 vm_trace.$(OBJEXT): {$(VPATH)}backward/2/inttypes.h
 vm_trace.$(OBJEXT): {$(VPATH)}backward/2/limits.h
diff --git a/enc/depend b/enc/depend
index 1e41e2dc1d..2c44ff14d0 100644
--- a/enc/depend
+++ b/enc/depend
@@ -325,7 +325,6 @@ enc/ascii.$(OBJEXT): assert.h
 enc/ascii.$(OBJEXT): backward/2/assume.h
 enc/ascii.$(OBJEXT): backward/2/attributes.h
 enc/ascii.$(OBJEXT): backward/2/bool.h
-enc/ascii.$(OBJEXT): backward/2/extern.h
 enc/ascii.$(OBJEXT): backward/2/gcc_version_since.h
 enc/ascii.$(OBJEXT): backward/2/inttypes.h
 enc/ascii.$(OBJEXT): backward/2/limits.h
@@ -392,7 +391,6 @@ enc/big5.$(OBJEXT): assert.h
 enc/big5.$(OBJEXT): backward/2/assume.h
 enc/big5.$(OBJEXT): backward/2/attributes.h
 enc/big5.$(OBJEXT): backward/2/bool.h
-enc/big5.$(OBJEXT): backward/2/extern.h
 enc/big5.$(OBJEXT): backward/2/gcc_version_since.h
 enc/big5.$(OBJEXT): backward/2/long_long.h
 enc/big5.$(OBJEXT): backward/2/stdalign.h
@@ -550,7 +548,6 @@ enc/cesu_8.$(OBJEXT): backward.h
 enc/cesu_8.$(OBJEXT): backward/2/assume.h
 enc/cesu_8.$(OBJEXT): backward/2/attributes.h
 enc/cesu_8.$(OBJEXT): backward/2/bool.h
-enc/cesu_8.$(OBJEXT): backward/2/extern.h
 enc/cesu_8.$(OBJEXT): backward/2/gcc_version_since.h
 enc/cesu_8.$(OBJEXT): backward/2/inttypes.h
 enc/cesu_8.$(OBJEXT): backward/2/limits.h
@@ -617,7 +614,6 @@ enc/cp949.$(OBJEXT): assert.h
 enc/cp949.$(OBJEXT): backward/2/assume.h
 enc/cp949.$(OBJEXT): backward/2/attributes.h
 enc/cp949.$(OBJEXT): backward/2/bool.h
-enc/cp949.$(OBJEXT): backward/2/extern.h
 enc/cp949.$(OBJEXT): backward/2/gcc_version_since.h
 enc/cp949.$(OBJEXT): backward/2/long_long.h
 enc/cp949.$(OBJEXT): backward/2/stdalign.h
@@ -675,7 +671,6 @@ enc/emacs_mule.$(OBJEXT): assert.h
 enc/emacs_mule.$(OBJEXT): backward/2/assume.h
 enc/emacs_mule.$(OBJEXT): backward/2/attributes.h
 enc/emacs_mule.$(OBJEXT): backward/2/bool.h
-enc/emacs_mule.$(OBJEXT): backward/2/extern.h
 enc/emacs_mule.$(OBJEXT): backward/2/gcc_version_since.h
 enc/emacs_mule.$(OBJEXT): backward/2/long_long.h
 enc/emacs_mule.$(OBJEXT): backward/2/stdalign.h
@@ -834,7 +829,6 @@ enc/encdb.$(OBJEXT): backward.h
 enc/encdb.$(OBJEXT): backward/2/assume.h
 enc/encdb.$(OBJEXT): backward/2/attributes.h
 enc/encdb.$(OBJEXT): backward/2/bool.h
-enc/encdb.$(OBJEXT): backward/2/extern.h
 enc/encdb.$(OBJEXT): backward/2/gcc_version_since.h
 enc/encdb.$(OBJEXT): backward/2/inttypes.h
 enc/encdb.$(OBJEXT): backward/2/limits.h
@@ -902,7 +896,6 @@ enc/euc_jp.$(OBJEXT): assert.h
 enc/euc_jp.$(OBJEXT): backward/2/assume.h
 enc/euc_jp.$(OBJEXT): backward/2/attributes.h
 enc/euc_jp.$(OBJEXT): backward/2/bool.h
-enc/euc_jp.$(OBJEXT): backward/2/extern.h
 enc/euc_jp.$(OBJEXT): backward/2/gcc_version_since.h
 enc/euc_jp.$(OBJEXT): backward/2/long_long.h
 enc/euc_jp.$(OBJEXT): backward/2/stdalign.h
@@ -962,7 +955,6 @@ enc/euc_kr.$(OBJEXT): assert.h
 enc/euc_kr.$(OBJEXT): backward/2/assume.h
 enc/euc_kr.$(OBJEXT): backward/2/attributes.h
 enc/euc_kr.$(OBJEXT): backward/2/bool.h
-enc/euc_kr.$(OBJEXT): backward/2/extern.h
 enc/euc_kr.$(OBJEXT): backward/2/gcc_version_since.h
 enc/euc_kr.$(OBJEXT): backward/2/long_long.h
 enc/euc_kr.$(OBJEXT): backward/2/stdalign.h
@@ -1020,7 +1012,6 @@ enc/euc_tw.$(OBJEXT): assert.h
 enc/euc_tw.$(OBJEXT): backward/2/assume.h
 enc/euc_tw.$(OBJEXT): backward/2/attributes.h
 enc/euc_tw.$(OBJEXT): backward/2/bool.h
-enc/euc_tw.$(OBJEXT): backward/2/extern.h
 enc/euc_tw.$(OBJEXT): backward/2/gcc_version_since.h
 enc/euc_tw.$(OBJEXT): backward/2/long_long.h
 enc/euc_tw.$(OBJEXT): backward/2/stdalign.h
@@ -1078,7 +1069,6 @@ enc/gb18030.$(OBJEXT): assert.h
 enc/gb18030.$(OBJEXT): backward/2/assume.h
 enc/gb18030.$(OBJEXT): backward/2/attributes.h
 enc/gb18030.$(OBJEXT): backward/2/bool.h
-enc/gb18030.$(OBJEXT): backward/2/extern.h
 enc/gb18030.$(OBJEXT): backward/2/gcc_version_since.h
 enc/gb18030.$(OBJEXT): backward/2/long_long.h
 enc/gb18030.$(OBJEXT): backward/2/stdalign.h
@@ -1136,7 +1126,6 @@ enc/gb2312.$(OBJEXT): assert.h
 enc/gb2312.$(OBJEXT): backward/2/assume.h
 enc/gb2312.$(OBJEXT): backward/2/attributes.h
 enc/gb2312.$(OBJEXT): backward/2/bool.h
-enc/gb2312.$(OBJEXT): backward/2/extern.h
 enc/gb2312.$(OBJEXT): backward/2/gcc_version_since.h
 enc/gb2312.$(OBJEXT): backward/2/long_long.h
 enc/gb2312.$(OBJEXT): backward/2/stdalign.h
@@ -1194,7 +1183,6 @@ enc/gbk.$(OBJEXT): assert.h
 enc/gbk.$(OBJEXT): backward/2/assume.h
 enc/gbk.$(OBJEXT): backward/2/attributes.h
 enc/gbk.$(OBJEXT): backward/2/bool.h
-enc/gbk.$(OBJEXT): backward/2/extern.h
 enc/gbk.$(OBJEXT): backward/2/gcc_version_since.h
 enc/gbk.$(OBJEXT): backward/2/long_long.h
 enc/gbk.$(OBJEXT): backward/2/stdalign.h
@@ -1252,7 +1240,6 @@ enc/iso_8859_1.$(OBJEXT): assert.h
 enc/iso_8859_1.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_1.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_1.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_1.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_1.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_1.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_1.$(OBJEXT): backward/2/stdalign.h
@@ -1311,7 +1298,6 @@ enc/iso_8859_10.$(OBJEXT): assert.h
 enc/iso_8859_10.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_10.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_10.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_10.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_10.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_10.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_10.$(OBJEXT): backward/2/stdalign.h
@@ -1370,7 +1356,6 @@ enc/iso_8859_11.$(OBJEXT): assert.h
 enc/iso_8859_11.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_11.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_11.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_11.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_11.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_11.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_11.$(OBJEXT): backward/2/stdalign.h
@@ -1428,7 +1413,6 @@ enc/iso_8859_13.$(OBJEXT): assert.h
 enc/iso_8859_13.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_13.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_13.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_13.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_13.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_13.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_13.$(OBJEXT): backward/2/stdalign.h
@@ -1487,7 +1471,6 @@ enc/iso_8859_14.$(OBJEXT): assert.h
 enc/iso_8859_14.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_14.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_14.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_14.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_14.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_14.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_14.$(OBJEXT): backward/2/stdalign.h
@@ -1546,7 +1529,6 @@ enc/iso_8859_15.$(OBJEXT): assert.h
 enc/iso_8859_15.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_15.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_15.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_15.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_15.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_15.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_15.$(OBJEXT): backward/2/stdalign.h
@@ -1605,7 +1587,6 @@ enc/iso_8859_16.$(OBJEXT): assert.h
 enc/iso_8859_16.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_16.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_16.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_16.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_16.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_16.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_16.$(OBJEXT): backward/2/stdalign.h
@@ -1664,7 +1645,6 @@ enc/iso_8859_2.$(OBJEXT): assert.h
 enc/iso_8859_2.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_2.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_2.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_2.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_2.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_2.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_2.$(OBJEXT): backward/2/stdalign.h
@@ -1723,7 +1703,6 @@ enc/iso_8859_3.$(OBJEXT): assert.h
 enc/iso_8859_3.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_3.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_3.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_3.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_3.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_3.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_3.$(OBJEXT): backward/2/stdalign.h
@@ -1782,7 +1761,6 @@ enc/iso_8859_4.$(OBJEXT): assert.h
 enc/iso_8859_4.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_4.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_4.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_4.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_4.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_4.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_4.$(OBJEXT): backward/2/stdalign.h
@@ -1841,7 +1819,6 @@ enc/iso_8859_5.$(OBJEXT): assert.h
 enc/iso_8859_5.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_5.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_5.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_5.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_5.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_5.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_5.$(OBJEXT): backward/2/stdalign.h
@@ -1899,7 +1876,6 @@ enc/iso_8859_6.$(OBJEXT): assert.h
 enc/iso_8859_6.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_6.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_6.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_6.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_6.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_6.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_6.$(OBJEXT): backward/2/stdalign.h
@@ -1957,7 +1933,6 @@ enc/iso_8859_7.$(OBJEXT): assert.h
 enc/iso_8859_7.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_7.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_7.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_7.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_7.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_7.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_7.$(OBJEXT): backward/2/stdalign.h
@@ -2015,7 +1990,6 @@ enc/iso_8859_8.$(OBJEXT): assert.h
 enc/iso_8859_8.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_8.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_8.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_8.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_8.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_8.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_8.$(OBJEXT): backward/2/stdalign.h
@@ -2073,7 +2047,6 @@ enc/iso_8859_9.$(OBJEXT): assert.h
 enc/iso_8859_9.$(OBJEXT): backward/2/assume.h
 enc/iso_8859_9.$(OBJEXT): backward/2/attributes.h
 enc/iso_8859_9.$(OBJEXT): backward/2/bool.h
-enc/iso_8859_9.$(OBJEXT): backward/2/extern.h
 enc/iso_8859_9.$(OBJEXT): backward/2/gcc_version_since.h
 enc/iso_8859_9.$(OBJEXT): backward/2/long_long.h
 enc/iso_8859_9.$(OBJEXT): backward/2/stdalign.h
@@ -2132,7 +2105,6 @@ enc/koi8_r.$(OBJEXT): assert.h
 enc/koi8_r.$(OBJEXT): backward/2/assume.h
 enc/koi8_r.$(OBJEXT): backward/2/attributes.h
 enc/koi8_r.$(OBJEXT): backward/2/bool.h
-enc/koi8_r.$(OBJEXT): backward/2/extern.h
 enc/koi8_r.$(OBJEXT): backward/2/gcc_version_since.h
 enc/koi8_r.$(OBJEXT): backward/2/long_long.h
 enc/koi8_r.$(OBJEXT): backward/2/stdalign.h
@@ -2190,7 +2162,6 @@ enc/koi8_u.$(OBJEXT): assert.h
 enc/koi8_u.$(OBJEXT): backward/2/assume.h
 enc/koi8_u.$(OBJEXT): backward/2/attributes.h
 enc/koi8_u.$(OBJEXT): backward/2/bool.h
-enc/koi8_u.$(OBJEXT): backward/2/extern.h
 enc/koi8_u.$(OBJEXT): backward/2/gcc_version_since.h
 enc/koi8_u.$(OBJEXT): backward/2/long_long.h
 enc/koi8_u.$(OBJEXT): backward/2/stdalign.h
@@ -2248,7 +2219,6 @@ enc/shift_jis.$(OBJEXT): assert.h
 enc/shift_jis.$(OBJEXT): backward/2/assume.h
 enc/shift_jis.$(OBJEXT): backward/2/attributes.h
 enc/shift_jis.$(OBJEXT): backward/2/bool.h
-enc/shift_jis.$(OBJEXT): backward/2/extern.h
 enc/shift_jis.$(OBJEXT): backward/2/gcc_version_since.h
 enc/shift_jis.$(OBJEXT): backward/2/long_long.h
 enc/shift_jis.$(OBJEXT): backward/2/stdalign.h
@@ -2408,7 +2378,6 @@ enc/trans/big5.$(OBJEXT): backward.h
 enc/trans/big5.$(OBJEXT): backward/2/assume.h
 enc/trans/big5.$(OBJEXT): backward/2/attributes.h
 enc/trans/big5.$(OBJEXT): backward/2/bool.h
-enc/trans/big5.$(OBJEXT): backward/2/extern.h
 enc/trans/big5.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/big5.$(OBJEXT): backward/2/inttypes.h
 enc/trans/big5.$(OBJEXT): backward/2/limits.h
@@ -2571,7 +2540,6 @@ enc/trans/cesu_8.$(OBJEXT): backward.h
 enc/trans/cesu_8.$(OBJEXT): backward/2/assume.h
 enc/trans/cesu_8.$(OBJEXT): backward/2/attributes.h
 enc/trans/cesu_8.$(OBJEXT): backward/2/bool.h
-enc/trans/cesu_8.$(OBJEXT): backward/2/extern.h
 enc/trans/cesu_8.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/cesu_8.$(OBJEXT): backward/2/inttypes.h
 enc/trans/cesu_8.$(OBJEXT): backward/2/limits.h
@@ -2734,7 +2702,6 @@ enc/trans/chinese.$(OBJEXT): backward.h
 enc/trans/chinese.$(OBJEXT): backward/2/assume.h
 enc/trans/chinese.$(OBJEXT): backward/2/attributes.h
 enc/trans/chinese.$(OBJEXT): backward/2/bool.h
-enc/trans/chinese.$(OBJEXT): backward/2/extern.h
 enc/trans/chinese.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/chinese.$(OBJEXT): backward/2/inttypes.h
 enc/trans/chinese.$(OBJEXT): backward/2/limits.h
@@ -2897,7 +2864,6 @@ enc/trans/ebcdic.$(OBJEXT): backward.h
 enc/trans/ebcdic.$(OBJEXT): backward/2/assume.h
 enc/trans/ebcdic.$(OBJEXT): backward/2/attributes.h
 enc/trans/ebcdic.$(OBJEXT): backward/2/bool.h
-enc/trans/ebcdic.$(OBJEXT): backward/2/extern.h
 enc/trans/ebcdic.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/ebcdic.$(OBJEXT): backward/2/inttypes.h
 enc/trans/ebcdic.$(OBJEXT): backward/2/limits.h
@@ -3060,7 +3026,6 @@ enc/trans/emoji.$(OBJEXT): backward.h
 enc/trans/emoji.$(OBJEXT): backward/2/assume.h
 enc/trans/emoji.$(OBJEXT): backward/2/attributes.h
 enc/trans/emoji.$(OBJEXT): backward/2/bool.h
-enc/trans/emoji.$(OBJEXT): backward/2/extern.h
 enc/trans/emoji.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/emoji.$(OBJEXT): backward/2/inttypes.h
 enc/trans/emoji.$(OBJEXT): backward/2/limits.h
@@ -3223,7 +3188,6 @@ enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward.h
 enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/assume.h
 enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/attributes.h
 enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/bool.h
-enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/extern.h
 enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/inttypes.h
 enc/trans/emoji_iso2022_kddi.$(OBJEXT): backward/2/limits.h
@@ -3386,7 +3350,6 @@ enc/trans/emoji_sjis_docomo.$(OBJEXT): backward.h
 enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/assume.h
 enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/attributes.h
 enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/bool.h
-enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/extern.h
 enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/inttypes.h
 enc/trans/emoji_sjis_docomo.$(OBJEXT): backward/2/limits.h
@@ -3549,7 +3512,6 @@ enc/trans/emoji_sjis_kddi.$(OBJEXT): backward.h
 enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/assume.h
 enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/attributes.h
 enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/bool.h
-enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/extern.h
 enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/inttypes.h
 enc/trans/emoji_sjis_kddi.$(OBJEXT): backward/2/limits.h
@@ -3712,7 +3674,6 @@ enc/trans/emoji_sjis_softbank.$(OBJEXT): backward.h
 enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/assume.h
 enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/attributes.h
 enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/bool.h
-enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/extern.h
 enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/inttypes.h
 enc/trans/emoji_sjis_softbank.$(OBJEXT): backward/2/limits.h
@@ -3875,7 +3836,6 @@ enc/trans/escape.$(OBJEXT): backward.h
 enc/trans/escape.$(OBJEXT): backward/2/assume.h
 enc/trans/escape.$(OBJEXT): backward/2/attributes.h
 enc/trans/escape.$(OBJEXT): backward/2/bool.h
-enc/trans/escape.$(OBJEXT): backward/2/extern.h
 enc/trans/escape.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/escape.$(OBJEXT): backward/2/inttypes.h
 enc/trans/escape.$(OBJEXT): backward/2/limits.h
@@ -4038,7 +3998,6 @@ enc/trans/gb18030.$(OBJEXT): backward.h
 enc/trans/gb18030.$(OBJEXT): backward/2/assume.h
 enc/trans/gb18030.$(OBJEXT): backward/2/attributes.h
 enc/trans/gb18030.$(OBJEXT): backward/2/bool.h
-enc/trans/gb18030.$(OBJEXT): backward/2/extern.h
 enc/trans/gb18030.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/gb18030.$(OBJEXT): backward/2/inttypes.h
 enc/trans/gb18030.$(OBJEXT): backward/2/limits.h
@@ -4201,7 +4160,6 @@ enc/trans/gbk.$(OBJEXT): backward.h
 enc/trans/gbk.$(OBJEXT): backward/2/assume.h
 enc/trans/gbk.$(OBJEXT): backward/2/attributes.h
 enc/trans/gbk.$(OBJEXT): backward/2/bool.h
-enc/trans/gbk.$(OBJEXT): backward/2/extern.h
 enc/trans/gbk.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/gbk.$(OBJEXT): backward/2/inttypes.h
 enc/trans/gbk.$(OBJEXT): backward/2/limits.h
@@ -4364,7 +4322,6 @@ enc/trans/iso2022.$(OBJEXT): backward.h
 enc/trans/iso2022.$(OBJEXT): backward/2/assume.h
 enc/trans/iso2022.$(OBJEXT): backward/2/attributes.h
 enc/trans/iso2022.$(OBJEXT): backward/2/bool.h
-enc/trans/iso2022.$(OBJEXT): backward/2/extern.h
 enc/trans/iso2022.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/iso2022.$(OBJEXT): backward/2/inttypes.h
 enc/trans/iso2022.$(OBJEXT): backward/2/limits.h
@@ -4527,7 +4484,6 @@ enc/trans/japanese.$(OBJEXT): backward.h
 enc/trans/japanese.$(OBJEXT): backward/2/assume.h
 enc/trans/japanese.$(OBJEXT): backward/2/attributes.h
 enc/trans/japanese.$(OBJEXT): backward/2/bool.h
-enc/trans/japanese.$(OBJEXT): backward/2/extern.h
 enc/trans/japanese.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/japanese.$(OBJEXT): backward/2/inttypes.h
 enc/trans/japanese.$(OBJEXT): backward/2/limits.h
@@ -4690,7 +4646,6 @@ enc/trans/japanese_euc.$(OBJEXT): backward.h
 enc/trans/japanese_euc.$(OBJEXT): backward/2/assume.h
 enc/trans/japanese_euc.$(OBJEXT): backward/2/attributes.h
 enc/trans/japanese_euc.$(OBJEXT): backward/2/bool.h
-enc/trans/japanese_euc.$(OBJEXT): backward/2/extern.h
 enc/trans/japanese_euc.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/japanese_euc.$(OBJEXT): backward/2/inttypes.h
 enc/trans/japanese_euc.$(OBJEXT): backward/2/limits.h
@@ -4853,7 +4808,6 @@ enc/trans/japanese_sjis.$(OBJEXT): backward.h
 enc/trans/japanese_sjis.$(OBJEXT): backward/2/assume.h
 enc/trans/japanese_sjis.$(OBJEXT): backward/2/attributes.h
 enc/trans/japanese_sjis.$(OBJEXT): backward/2/bool.h
-enc/trans/japanese_sjis.$(OBJEXT): backward/2/extern.h
 enc/trans/japanese_sjis.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/japanese_sjis.$(OBJEXT): backward/2/inttypes.h
 enc/trans/japanese_sjis.$(OBJEXT): backward/2/limits.h
@@ -5016,7 +4970,6 @@ enc/trans/korean.$(OBJEXT): backward.h
 enc/trans/korean.$(OBJEXT): backward/2/assume.h
 enc/trans/korean.$(OBJEXT): backward/2/attributes.h
 enc/trans/korean.$(OBJEXT): backward/2/bool.h
-enc/trans/korean.$(OBJEXT): backward/2/extern.h
 enc/trans/korean.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/korean.$(OBJEXT): backward/2/inttypes.h
 enc/trans/korean.$(OBJEXT): backward/2/limits.h
@@ -5178,7 +5131,6 @@ enc/trans/newline.$(OBJEXT): assert.h
 enc/trans/newline.$(OBJEXT): backward/2/assume.h
 enc/trans/newline.$(OBJEXT): backward/2/attributes.h
 enc/trans/newline.$(OBJEXT): backward/2/bool.h
-enc/trans/newline.$(OBJEXT): backward/2/extern.h
 enc/trans/newline.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/newline.$(OBJEXT): backward/2/inttypes.h
 enc/trans/newline.$(OBJEXT): backward/2/limits.h
@@ -5341,7 +5293,6 @@ enc/trans/single_byte.$(OBJEXT): backward.h
 enc/trans/single_byte.$(OBJEXT): backward/2/assume.h
 enc/trans/single_byte.$(OBJEXT): backward/2/attributes.h
 enc/trans/single_byte.$(OBJEXT): backward/2/bool.h
-enc/trans/single_byte.$(OBJEXT): backward/2/extern.h
 enc/trans/single_byte.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/single_byte.$(OBJEXT): backward/2/inttypes.h
 enc/trans/single_byte.$(OBJEXT): backward/2/limits.h
@@ -5506,7 +5457,6 @@ enc/trans/utf8_mac.$(OBJEXT): backward.h
 enc/trans/utf8_mac.$(OBJEXT): backward/2/assume.h
 enc/trans/utf8_mac.$(OBJEXT): backward/2/attributes.h
 enc/trans/utf8_mac.$(OBJEXT): backward/2/bool.h
-enc/trans/utf8_mac.$(OBJEXT): backward/2/extern.h
 enc/trans/utf8_mac.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/utf8_mac.$(OBJEXT): backward/2/inttypes.h
 enc/trans/utf8_mac.$(OBJEXT): backward/2/limits.h
@@ -5669,7 +5619,6 @@ enc/trans/utf_16_32.$(OBJEXT): backward.h
 enc/trans/utf_16_32.$(OBJEXT): backward/2/assume.h
 enc/trans/utf_16_32.$(OBJEXT): backward/2/attributes.h
 enc/trans/utf_16_32.$(OBJEXT): backward/2/bool.h
-enc/trans/utf_16_32.$(OBJEXT): backward/2/extern.h
 enc/trans/utf_16_32.$(OBJEXT): backward/2/gcc_version_since.h
 enc/trans/utf_16_32.$(OBJEXT): backward/2/inttypes.h
 enc/trans/utf_16_32.$(OBJEXT): backward/2/limits.h
@@ -5834,7 +5783,6 @@ enc/unicode.$(OBJEXT): assert.h
 enc/unicode.$(OBJEXT): backward/2/assume.h
 enc/unicode.$(OBJEXT): backward/2/attributes.h
 enc/unicode.$(OBJEXT): backward/2/bool.h
-enc/unicode.$(OBJEXT): backward/2/extern.h
 enc/unicode.$(OBJEXT): backward/2/gcc_version_since.h
 enc/unicode.$(OBJEXT): backward/2/inttypes.h
 enc/unicode.$(OBJEXT): backward/2/limits.h
@@ -5998,7 +5946,6 @@ enc/us_ascii.$(OBJEXT): assert.h
 enc/us_ascii.$(OBJEXT): backward/2/assume.h
 enc/us_ascii.$(OBJEXT): backward/2/attributes.h
 enc/us_ascii.$(OBJEXT): backward/2/bool.h
-enc/us_ascii.$(OBJEXT): backward/2/extern.h
 enc/us_ascii.$(OBJEXT): backward/2/gcc_version_since.h
 enc/us_ascii.$(OBJEXT): backward/2/inttypes.h
 enc/us_ascii.$(OBJEXT): backward/2/limits.h
@@ -6065,7 +6012,6 @@ enc/utf_16be.$(OBJEXT): assert.h
 enc/utf_16be.$(OBJEXT): backward/2/assume.h
 enc/utf_16be.$(OBJEXT): backward/2/attributes.h
 enc/utf_16be.$(OBJEXT): backward/2/bool.h
-enc/utf_16be.$(OBJEXT): backward/2/extern.h
 enc/utf_16be.$(OBJEXT): backward/2/gcc_version_since.h
 enc/utf_16be.$(OBJEXT): backward/2/long_long.h
 enc/utf_16be.$(OBJEXT): backward/2/stdalign.h
@@ -6124,7 +6070,6 @@ enc/utf_16le.$(OBJEXT): assert.h
 enc/utf_16le.$(OBJEXT): backward/2/assume.h
 enc/utf_16le.$(OBJEXT): backward/2/attributes.h
 enc/utf_16le.$(OBJEXT): backward/2/bool.h
-enc/utf_16le.$(OBJEXT): backward/2/extern.h
 enc/utf_16le.$(OBJEXT): backward/2/gcc_version_since.h
 enc/utf_16le.$(OBJEXT): backward/2/long_long.h
 enc/utf_16le.$(OBJEXT): backward/2/stdalign.h
@@ -6183,7 +6128,6 @@ enc/utf_32be.$(OBJEXT): assert.h
 enc/utf_32be.$(OBJEXT): backward/2/assume.h
 enc/utf_32be.$(OBJEXT): backward/2/attributes.h
 enc/utf_32be.$(OBJEXT): backward/2/bool.h
-enc/utf_32be.$(OBJEXT): backward/2/extern.h
 enc/utf_32be.$(OBJEXT): backward/2/gcc_version_since.h
 enc/utf_32be.$(OBJEXT): backward/2/long_long.h
 enc/utf_32be.$(OBJEXT): backward/2/stdalign.h
@@ -6242,7 +6186,6 @@ enc/utf_32le.$(OBJEXT): assert.h
 enc/utf_32le.$(OBJEXT): backward/2/assume.h
 enc/utf_32le.$(OBJEXT): backward/2/attributes.h
 enc/utf_32le.$(OBJEXT): backward/2/bool.h
-enc/utf_32le.$(OBJEXT): backward/2/extern.h
 enc/utf_32le.$(OBJEXT): backward/2/gcc_version_since.h
 enc/utf_32le.$(OBJEXT): backward/2/long_long.h
 enc/utf_32le.$(OBJEXT): backward/2/stdalign.h
@@ -6400,7 +6343,6 @@ enc/utf_8.$(OBJEXT): assert.h
 enc/utf_8.$(OBJEXT): backward/2/assume.h
 enc/utf_8.$(OBJEXT): backward/2/attributes.h
 enc/utf_8.$(OBJEXT): backward/2/bool.h
-enc/utf_8.$(OBJEXT): backward/2/extern.h
 enc/utf_8.$(OBJEXT): backward/2/gcc_version_since.h
 enc/utf_8.$(OBJEXT): backward/2/inttypes.h
 enc/utf_8.$(OBJEXT): backward/2/limits.h
@@ -6467,7 +6409,6 @@ enc/windows_1250.$(OBJEXT): assert.h
 enc/windows_1250.$(OBJEXT): backward/2/assume.h
 enc/windows_1250.$(OBJEXT): backward/2/attributes.h
 enc/windows_1250.$(OBJEXT): backward/2/bool.h
-enc/windows_1250.$(OBJEXT): backward/2/extern.h
 enc/windows_1250.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_1250.$(OBJEXT): backward/2/long_long.h
 enc/windows_1250.$(OBJEXT): backward/2/stdalign.h
@@ -6526,7 +6467,6 @@ enc/windows_1251.$(OBJEXT): assert.h
 enc/windows_1251.$(OBJEXT): backward/2/assume.h
 enc/windows_1251.$(OBJEXT): backward/2/attributes.h
 enc/windows_1251.$(OBJEXT): backward/2/bool.h
-enc/windows_1251.$(OBJEXT): backward/2/extern.h
 enc/windows_1251.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_1251.$(OBJEXT): backward/2/long_long.h
 enc/windows_1251.$(OBJEXT): backward/2/stdalign.h
@@ -6584,7 +6524,6 @@ enc/windows_1252.$(OBJEXT): assert.h
 enc/windows_1252.$(OBJEXT): backward/2/assume.h
 enc/windows_1252.$(OBJEXT): backward/2/attributes.h
 enc/windows_1252.$(OBJEXT): backward/2/bool.h
-enc/windows_1252.$(OBJEXT): backward/2/extern.h
 enc/windows_1252.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_1252.$(OBJEXT): backward/2/long_long.h
 enc/windows_1252.$(OBJEXT): backward/2/stdalign.h
@@ -6643,7 +6582,6 @@ enc/windows_1253.$(OBJEXT): assert.h
 enc/windows_1253.$(OBJEXT): backward/2/assume.h
 enc/windows_1253.$(OBJEXT): backward/2/attributes.h
 enc/windows_1253.$(OBJEXT): backward/2/bool.h
-enc/windows_1253.$(OBJEXT): backward/2/extern.h
 enc/windows_1253.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_1253.$(OBJEXT): backward/2/long_long.h
 enc/windows_1253.$(OBJEXT): backward/2/stdalign.h
@@ -6701,7 +6639,6 @@ enc/windows_1254.$(OBJEXT): assert.h
 enc/windows_1254.$(OBJEXT): backward/2/assume.h
 enc/windows_1254.$(OBJEXT): backward/2/attributes.h
 enc/windows_1254.$(OBJEXT): backward/2/bool.h
-enc/windows_1254.$(OBJEXT): backward/2/extern.h
 enc/windows_1254.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_1254.$(OBJEXT): backward/2/long_long.h
 enc/windows_1254.$(OBJEXT): backward/2/stdalign.h
@@ -6760,7 +6697,6 @@ enc/windows_1257.$(OBJEXT): assert.h
 enc/windows_1257.$(OBJEXT): backward/2/assume.h
 enc/windows_1257.$(OBJEXT): backward/2/attributes.h
 enc/windows_1257.$(OBJEXT): backward/2/bool.h
-enc/windows_1257.$(OBJEXT): backward/2/extern.h
 enc/windows_1257.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_1257.$(OBJEXT): backward/2/long_long.h
 enc/windows_1257.$(OBJEXT): backward/2/stdalign.h
@@ -6819,7 +6755,6 @@ enc/windows_31j.$(OBJEXT): assert.h
 enc/windows_31j.$(OBJEXT): backward/2/assume.h
 enc/windows_31j.$(OBJEXT): backward/2/attributes.h
 enc/windows_31j.$(OBJEXT): backward/2/bool.h
-enc/windows_31j.$(OBJEXT): backward/2/extern.h
 enc/windows_31j.$(OBJEXT): backward/2/gcc_version_since.h
 enc/windows_31j.$(OBJEXT): backward/2/long_long.h
 enc/windows_31j.$(OBJEXT): backward/2/stdalign.h
diff --git a/ext/-test-/arith_seq/extract/depend b/ext/-test-/arith_seq/extract/depend
index aa33ed26ff..1d044ea106 100644
--- a/ext/-test-/arith_seq/extract/depend
+++ b/ext/-test-/arith_seq/extract/depend
@@ -146,7 +146,6 @@ extract.o: $(hdrdir)/ruby/backward.h
 extract.o: $(hdrdir)/ruby/backward/2/assume.h
 extract.o: $(hdrdir)/ruby/backward/2/attributes.h
 extract.o: $(hdrdir)/ruby/backward/2/bool.h
-extract.o: $(hdrdir)/ruby/backward/2/extern.h
 extract.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 extract.o: $(hdrdir)/ruby/backward/2/inttypes.h
 extract.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/array/resize/depend b/ext/-test-/array/resize/depend
index 27f622ec61..aad5d70a6b 100644
--- a/ext/-test-/array/resize/depend
+++ b/ext/-test-/array/resize/depend
@@ -146,7 +146,6 @@ resize.o: $(hdrdir)/ruby/backward.h
 resize.o: $(hdrdir)/ruby/backward/2/assume.h
 resize.o: $(hdrdir)/ruby/backward/2/attributes.h
 resize.o: $(hdrdir)/ruby/backward/2/bool.h
-resize.o: $(hdrdir)/ruby/backward/2/extern.h
 resize.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 resize.o: $(hdrdir)/ruby/backward/2/inttypes.h
 resize.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/bignum/depend b/ext/-test-/bignum/depend
index d93b2f02e4..b780d00b81 100644
--- a/ext/-test-/bignum/depend
+++ b/ext/-test-/bignum/depend
@@ -147,7 +147,6 @@ big2str.o: $(hdrdir)/ruby/backward.h
 big2str.o: $(hdrdir)/ruby/backward/2/assume.h
 big2str.o: $(hdrdir)/ruby/backward/2/attributes.h
 big2str.o: $(hdrdir)/ruby/backward/2/bool.h
-big2str.o: $(hdrdir)/ruby/backward/2/extern.h
 big2str.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 big2str.o: $(hdrdir)/ruby/backward/2/inttypes.h
 big2str.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -313,7 +312,6 @@ bigzero.o: $(hdrdir)/ruby/backward.h
 bigzero.o: $(hdrdir)/ruby/backward/2/assume.h
 bigzero.o: $(hdrdir)/ruby/backward/2/attributes.h
 bigzero.o: $(hdrdir)/ruby/backward/2/bool.h
-bigzero.o: $(hdrdir)/ruby/backward/2/extern.h
 bigzero.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bigzero.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bigzero.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -479,7 +477,6 @@ div.o: $(hdrdir)/ruby/backward.h
 div.o: $(hdrdir)/ruby/backward/2/assume.h
 div.o: $(hdrdir)/ruby/backward/2/attributes.h
 div.o: $(hdrdir)/ruby/backward/2/bool.h
-div.o: $(hdrdir)/ruby/backward/2/extern.h
 div.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 div.o: $(hdrdir)/ruby/backward/2/inttypes.h
 div.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -645,7 +642,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -809,7 +805,6 @@ intpack.o: $(hdrdir)/ruby/backward.h
 intpack.o: $(hdrdir)/ruby/backward/2/assume.h
 intpack.o: $(hdrdir)/ruby/backward/2/attributes.h
 intpack.o: $(hdrdir)/ruby/backward/2/bool.h
-intpack.o: $(hdrdir)/ruby/backward/2/extern.h
 intpack.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 intpack.o: $(hdrdir)/ruby/backward/2/inttypes.h
 intpack.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -975,7 +970,6 @@ mul.o: $(hdrdir)/ruby/backward.h
 mul.o: $(hdrdir)/ruby/backward/2/assume.h
 mul.o: $(hdrdir)/ruby/backward/2/attributes.h
 mul.o: $(hdrdir)/ruby/backward/2/bool.h
-mul.o: $(hdrdir)/ruby/backward/2/extern.h
 mul.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 mul.o: $(hdrdir)/ruby/backward/2/inttypes.h
 mul.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1141,7 +1135,6 @@ str2big.o: $(hdrdir)/ruby/backward.h
 str2big.o: $(hdrdir)/ruby/backward/2/assume.h
 str2big.o: $(hdrdir)/ruby/backward/2/attributes.h
 str2big.o: $(hdrdir)/ruby/backward/2/bool.h
-str2big.o: $(hdrdir)/ruby/backward/2/extern.h
 str2big.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 str2big.o: $(hdrdir)/ruby/backward/2/inttypes.h
 str2big.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/bug-14834/depend b/ext/-test-/bug-14834/depend
index 7c7a97f157..fa04fbe368 100644
--- a/ext/-test-/bug-14834/depend
+++ b/ext/-test-/bug-14834/depend
@@ -146,7 +146,6 @@ bug-14384.o: $(hdrdir)/ruby/backward.h
 bug-14384.o: $(hdrdir)/ruby/backward/2/assume.h
 bug-14384.o: $(hdrdir)/ruby/backward/2/attributes.h
 bug-14384.o: $(hdrdir)/ruby/backward/2/bool.h
-bug-14384.o: $(hdrdir)/ruby/backward/2/extern.h
 bug-14384.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bug-14384.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bug-14384.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/bug-3571/depend b/ext/-test-/bug-3571/depend
index a7fe67b636..35bbf693b6 100644
--- a/ext/-test-/bug-3571/depend
+++ b/ext/-test-/bug-3571/depend
@@ -147,7 +147,6 @@ bug.o: $(hdrdir)/ruby/backward.h
 bug.o: $(hdrdir)/ruby/backward/2/assume.h
 bug.o: $(hdrdir)/ruby/backward/2/attributes.h
 bug.o: $(hdrdir)/ruby/backward/2/bool.h
-bug.o: $(hdrdir)/ruby/backward/2/extern.h
 bug.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bug.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bug.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/bug-5832/depend b/ext/-test-/bug-5832/depend
index a7fe67b636..35bbf693b6 100644
--- a/ext/-test-/bug-5832/depend
+++ b/ext/-test-/bug-5832/depend
@@ -147,7 +147,6 @@ bug.o: $(hdrdir)/ruby/backward.h
 bug.o: $(hdrdir)/ruby/backward/2/assume.h
 bug.o: $(hdrdir)/ruby/backward/2/attributes.h
 bug.o: $(hdrdir)/ruby/backward/2/bool.h
-bug.o: $(hdrdir)/ruby/backward/2/extern.h
 bug.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bug.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bug.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/bug_reporter/depend b/ext/-test-/bug_reporter/depend
index 0d6d5b3a1d..31b257e323 100644
--- a/ext/-test-/bug_reporter/depend
+++ b/ext/-test-/bug_reporter/depend
@@ -147,7 +147,6 @@ bug_reporter.o: $(hdrdir)/ruby/backward.h
 bug_reporter.o: $(hdrdir)/ruby/backward/2/assume.h
 bug_reporter.o: $(hdrdir)/ruby/backward/2/attributes.h
 bug_reporter.o: $(hdrdir)/ruby/backward/2/bool.h
-bug_reporter.o: $(hdrdir)/ruby/backward/2/extern.h
 bug_reporter.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bug_reporter.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bug_reporter.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/class/depend b/ext/-test-/class/depend
index a1073573ad..360f9fe09d 100644
--- a/ext/-test-/class/depend
+++ b/ext/-test-/class/depend
@@ -146,7 +146,6 @@ class2name.o: $(hdrdir)/ruby/backward.h
 class2name.o: $(hdrdir)/ruby/backward/2/assume.h
 class2name.o: $(hdrdir)/ruby/backward/2/attributes.h
 class2name.o: $(hdrdir)/ruby/backward/2/bool.h
-class2name.o: $(hdrdir)/ruby/backward/2/extern.h
 class2name.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 class2name.o: $(hdrdir)/ruby/backward/2/inttypes.h
 class2name.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -310,7 +309,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/debug/depend b/ext/-test-/debug/depend
index 5bbfe13788..9b487d08f1 100644
--- a/ext/-test-/debug/depend
+++ b/ext/-test-/debug/depend
@@ -147,7 +147,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -310,7 +309,6 @@ inspector.o: $(hdrdir)/ruby/backward.h
 inspector.o: $(hdrdir)/ruby/backward/2/assume.h
 inspector.o: $(hdrdir)/ruby/backward/2/attributes.h
 inspector.o: $(hdrdir)/ruby/backward/2/bool.h
-inspector.o: $(hdrdir)/ruby/backward/2/extern.h
 inspector.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 inspector.o: $(hdrdir)/ruby/backward/2/inttypes.h
 inspector.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -474,7 +472,6 @@ profile_frames.o: $(hdrdir)/ruby/backward.h
 profile_frames.o: $(hdrdir)/ruby/backward/2/assume.h
 profile_frames.o: $(hdrdir)/ruby/backward/2/attributes.h
 profile_frames.o: $(hdrdir)/ruby/backward/2/bool.h
-profile_frames.o: $(hdrdir)/ruby/backward/2/extern.h
 profile_frames.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 profile_frames.o: $(hdrdir)/ruby/backward/2/inttypes.h
 profile_frames.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/enumerator_kw/depend b/ext/-test-/enumerator_kw/depend
index 14a06e4911..12a066ffdf 100644
--- a/ext/-test-/enumerator_kw/depend
+++ b/ext/-test-/enumerator_kw/depend
@@ -147,7 +147,6 @@ enumerator_kw.o: $(hdrdir)/ruby/backward.h
 enumerator_kw.o: $(hdrdir)/ruby/backward/2/assume.h
 enumerator_kw.o: $(hdrdir)/ruby/backward/2/attributes.h
 enumerator_kw.o: $(hdrdir)/ruby/backward/2/bool.h
-enumerator_kw.o: $(hdrdir)/ruby/backward/2/extern.h
 enumerator_kw.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 enumerator_kw.o: $(hdrdir)/ruby/backward/2/inttypes.h
 enumerator_kw.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/exception/depend b/ext/-test-/exception/depend
index 10d563b149..c43510c3b5 100644
--- a/ext/-test-/exception/depend
+++ b/ext/-test-/exception/depend
@@ -146,7 +146,6 @@ dataerror.o: $(hdrdir)/ruby/backward.h
 dataerror.o: $(hdrdir)/ruby/backward/2/assume.h
 dataerror.o: $(hdrdir)/ruby/backward/2/attributes.h
 dataerror.o: $(hdrdir)/ruby/backward/2/bool.h
-dataerror.o: $(hdrdir)/ruby/backward/2/extern.h
 dataerror.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 dataerror.o: $(hdrdir)/ruby/backward/2/inttypes.h
 dataerror.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -310,7 +309,6 @@ enc_raise.o: $(hdrdir)/ruby/backward.h
 enc_raise.o: $(hdrdir)/ruby/backward/2/assume.h
 enc_raise.o: $(hdrdir)/ruby/backward/2/attributes.h
 enc_raise.o: $(hdrdir)/ruby/backward/2/bool.h
-enc_raise.o: $(hdrdir)/ruby/backward/2/extern.h
 enc_raise.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 enc_raise.o: $(hdrdir)/ruby/backward/2/inttypes.h
 enc_raise.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -477,7 +475,6 @@ ensured.o: $(hdrdir)/ruby/backward.h
 ensured.o: $(hdrdir)/ruby/backward/2/assume.h
 ensured.o: $(hdrdir)/ruby/backward/2/attributes.h
 ensured.o: $(hdrdir)/ruby/backward/2/bool.h
-ensured.o: $(hdrdir)/ruby/backward/2/extern.h
 ensured.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ensured.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ensured.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -641,7 +638,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/fatal/depend b/ext/-test-/fatal/depend
index 929ee76a00..7d8b349739 100644
--- a/ext/-test-/fatal/depend
+++ b/ext/-test-/fatal/depend
@@ -147,7 +147,6 @@ rb_fatal.o: $(hdrdir)/ruby/backward.h
 rb_fatal.o: $(hdrdir)/ruby/backward/2/assume.h
 rb_fatal.o: $(hdrdir)/ruby/backward/2/attributes.h
 rb_fatal.o: $(hdrdir)/ruby/backward/2/bool.h
-rb_fatal.o: $(hdrdir)/ruby/backward/2/extern.h
 rb_fatal.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 rb_fatal.o: $(hdrdir)/ruby/backward/2/inttypes.h
 rb_fatal.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/file/depend b/ext/-test-/file/depend
index e3901642fa..89b11a63d8 100644
--- a/ext/-test-/file/depend
+++ b/ext/-test-/file/depend
@@ -146,7 +146,6 @@ fs.o: $(hdrdir)/ruby/backward.h
 fs.o: $(hdrdir)/ruby/backward/2/assume.h
 fs.o: $(hdrdir)/ruby/backward/2/attributes.h
 fs.o: $(hdrdir)/ruby/backward/2/bool.h
-fs.o: $(hdrdir)/ruby/backward/2/extern.h
 fs.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 fs.o: $(hdrdir)/ruby/backward/2/inttypes.h
 fs.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -314,7 +313,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -477,7 +475,6 @@ stat.o: $(hdrdir)/ruby/backward.h
 stat.o: $(hdrdir)/ruby/backward/2/assume.h
 stat.o: $(hdrdir)/ruby/backward/2/attributes.h
 stat.o: $(hdrdir)/ruby/backward/2/bool.h
-stat.o: $(hdrdir)/ruby/backward/2/extern.h
 stat.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 stat.o: $(hdrdir)/ruby/backward/2/inttypes.h
 stat.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/float/depend b/ext/-test-/float/depend
index 6276d0fb1e..015f1d605a 100644
--- a/ext/-test-/float/depend
+++ b/ext/-test-/float/depend
@@ -150,7 +150,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -314,7 +313,6 @@ nextafter.o: $(hdrdir)/ruby/backward.h
 nextafter.o: $(hdrdir)/ruby/backward/2/assume.h
 nextafter.o: $(hdrdir)/ruby/backward/2/attributes.h
 nextafter.o: $(hdrdir)/ruby/backward/2/bool.h
-nextafter.o: $(hdrdir)/ruby/backward/2/extern.h
 nextafter.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 nextafter.o: $(hdrdir)/ruby/backward/2/inttypes.h
 nextafter.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/funcall/depend b/ext/-test-/funcall/depend
index 055ce1852a..db81f379b2 100644
--- a/ext/-test-/funcall/depend
+++ b/ext/-test-/funcall/depend
@@ -147,7 +147,6 @@ funcall.o: $(hdrdir)/ruby/backward.h
 funcall.o: $(hdrdir)/ruby/backward/2/assume.h
 funcall.o: $(hdrdir)/ruby/backward/2/attributes.h
 funcall.o: $(hdrdir)/ruby/backward/2/bool.h
-funcall.o: $(hdrdir)/ruby/backward/2/extern.h
 funcall.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 funcall.o: $(hdrdir)/ruby/backward/2/inttypes.h
 funcall.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/gvl/call_without_gvl/depend b/ext/-test-/gvl/call_without_gvl/depend
index 5e21ac12f8..9ab1ce4e09 100644
--- a/ext/-test-/gvl/call_without_gvl/depend
+++ b/ext/-test-/gvl/call_without_gvl/depend
@@ -146,7 +146,6 @@ call_without_gvl.o: $(hdrdir)/ruby/backward.h
 call_without_gvl.o: $(hdrdir)/ruby/backward/2/assume.h
 call_without_gvl.o: $(hdrdir)/ruby/backward/2/attributes.h
 call_without_gvl.o: $(hdrdir)/ruby/backward/2/bool.h
-call_without_gvl.o: $(hdrdir)/ruby/backward/2/extern.h
 call_without_gvl.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 call_without_gvl.o: $(hdrdir)/ruby/backward/2/inttypes.h
 call_without_gvl.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/hash/depend b/ext/-test-/hash/depend
index 10bc36f5c4..31206a7aa8 100644
--- a/ext/-test-/hash/depend
+++ b/ext/-test-/hash/depend
@@ -147,7 +147,6 @@ delete.o: $(hdrdir)/ruby/backward.h
 delete.o: $(hdrdir)/ruby/backward/2/assume.h
 delete.o: $(hdrdir)/ruby/backward/2/attributes.h
 delete.o: $(hdrdir)/ruby/backward/2/bool.h
-delete.o: $(hdrdir)/ruby/backward/2/extern.h
 delete.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 delete.o: $(hdrdir)/ruby/backward/2/inttypes.h
 delete.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/integer/depend b/ext/-test-/integer/depend
index bba4f5f7df..74e9a802f9 100644
--- a/ext/-test-/integer/depend
+++ b/ext/-test-/integer/depend
@@ -147,7 +147,6 @@ core_ext.o: $(hdrdir)/ruby/backward.h
 core_ext.o: $(hdrdir)/ruby/backward/2/assume.h
 core_ext.o: $(hdrdir)/ruby/backward/2/attributes.h
 core_ext.o: $(hdrdir)/ruby/backward/2/bool.h
-core_ext.o: $(hdrdir)/ruby/backward/2/extern.h
 core_ext.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 core_ext.o: $(hdrdir)/ruby/backward/2/inttypes.h
 core_ext.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -320,7 +319,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -484,7 +482,6 @@ my_integer.o: $(hdrdir)/ruby/backward.h
 my_integer.o: $(hdrdir)/ruby/backward/2/assume.h
 my_integer.o: $(hdrdir)/ruby/backward/2/attributes.h
 my_integer.o: $(hdrdir)/ruby/backward/2/bool.h
-my_integer.o: $(hdrdir)/ruby/backward/2/extern.h
 my_integer.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 my_integer.o: $(hdrdir)/ruby/backward/2/inttypes.h
 my_integer.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/iseq_load/depend b/ext/-test-/iseq_load/depend
index 7002875b2f..399fde4351 100644
--- a/ext/-test-/iseq_load/depend
+++ b/ext/-test-/iseq_load/depend
@@ -147,7 +147,6 @@ iseq_load.o: $(hdrdir)/ruby/backward.h
 iseq_load.o: $(hdrdir)/ruby/backward/2/assume.h
 iseq_load.o: $(hdrdir)/ruby/backward/2/attributes.h
 iseq_load.o: $(hdrdir)/ruby/backward/2/bool.h
-iseq_load.o: $(hdrdir)/ruby/backward/2/extern.h
 iseq_load.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 iseq_load.o: $(hdrdir)/ruby/backward/2/inttypes.h
 iseq_load.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/iter/depend b/ext/-test-/iter/depend
index ee9074af4a..f4a63add2d 100644
--- a/ext/-test-/iter/depend
+++ b/ext/-test-/iter/depend
@@ -147,7 +147,6 @@ break.o: $(hdrdir)/ruby/backward.h
 break.o: $(hdrdir)/ruby/backward/2/assume.h
 break.o: $(hdrdir)/ruby/backward/2/attributes.h
 break.o: $(hdrdir)/ruby/backward/2/bool.h
-break.o: $(hdrdir)/ruby/backward/2/extern.h
 break.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 break.o: $(hdrdir)/ruby/backward/2/inttypes.h
 break.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -475,7 +473,6 @@ yield.o: $(hdrdir)/ruby/backward.h
 yield.o: $(hdrdir)/ruby/backward/2/assume.h
 yield.o: $(hdrdir)/ruby/backward/2/attributes.h
 yield.o: $(hdrdir)/ruby/backward/2/bool.h
-yield.o: $(hdrdir)/ruby/backward/2/extern.h
 yield.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 yield.o: $(hdrdir)/ruby/backward/2/inttypes.h
 yield.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/load/protect/depend b/ext/-test-/load/protect/depend
index 7ae10da4e2..2820af88fc 100644
--- a/ext/-test-/load/protect/depend
+++ b/ext/-test-/load/protect/depend
@@ -147,7 +147,6 @@ protect.o: $(hdrdir)/ruby/backward.h
 protect.o: $(hdrdir)/ruby/backward/2/assume.h
 protect.o: $(hdrdir)/ruby/backward/2/attributes.h
 protect.o: $(hdrdir)/ruby/backward/2/bool.h
-protect.o: $(hdrdir)/ruby/backward/2/extern.h
 protect.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 protect.o: $(hdrdir)/ruby/backward/2/inttypes.h
 protect.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/marshal/compat/depend b/ext/-test-/marshal/compat/depend
index 763984d917..234ac6ba58 100644
--- a/ext/-test-/marshal/compat/depend
+++ b/ext/-test-/marshal/compat/depend
@@ -147,7 +147,6 @@ usrcompat.o: $(hdrdir)/ruby/backward.h
 usrcompat.o: $(hdrdir)/ruby/backward/2/assume.h
 usrcompat.o: $(hdrdir)/ruby/backward/2/attributes.h
 usrcompat.o: $(hdrdir)/ruby/backward/2/bool.h
-usrcompat.o: $(hdrdir)/ruby/backward/2/extern.h
 usrcompat.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 usrcompat.o: $(hdrdir)/ruby/backward/2/inttypes.h
 usrcompat.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/marshal/internal_ivar/depend b/ext/-test-/marshal/internal_ivar/depend
index ffb78da047..7fe7b36d76 100644
--- a/ext/-test-/marshal/internal_ivar/depend
+++ b/ext/-test-/marshal/internal_ivar/depend
@@ -147,7 +147,6 @@ internal_ivar.o: $(hdrdir)/ruby/backward.h
 internal_ivar.o: $(hdrdir)/ruby/backward/2/assume.h
 internal_ivar.o: $(hdrdir)/ruby/backward/2/attributes.h
 internal_ivar.o: $(hdrdir)/ruby/backward/2/bool.h
-internal_ivar.o: $(hdrdir)/ruby/backward/2/extern.h
 internal_ivar.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 internal_ivar.o: $(hdrdir)/ruby/backward/2/inttypes.h
 internal_ivar.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/marshal/usr/depend b/ext/-test-/marshal/usr/depend
index 666c183547..7a72afdccc 100644
--- a/ext/-test-/marshal/usr/depend
+++ b/ext/-test-/marshal/usr/depend
@@ -147,7 +147,6 @@ usrmarshal.o: $(hdrdir)/ruby/backward.h
 usrmarshal.o: $(hdrdir)/ruby/backward/2/assume.h
 usrmarshal.o: $(hdrdir)/ruby/backward/2/attributes.h
 usrmarshal.o: $(hdrdir)/ruby/backward/2/bool.h
-usrmarshal.o: $(hdrdir)/ruby/backward/2/extern.h
 usrmarshal.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 usrmarshal.o: $(hdrdir)/ruby/backward/2/inttypes.h
 usrmarshal.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/method/depend b/ext/-test-/method/depend
index 2b166a5f41..ea3f2049d5 100644
--- a/ext/-test-/method/depend
+++ b/ext/-test-/method/depend
@@ -147,7 +147,6 @@ arity.o: $(hdrdir)/ruby/backward.h
 arity.o: $(hdrdir)/ruby/backward/2/assume.h
 arity.o: $(hdrdir)/ruby/backward/2/attributes.h
 arity.o: $(hdrdir)/ruby/backward/2/bool.h
-arity.o: $(hdrdir)/ruby/backward/2/extern.h
 arity.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 arity.o: $(hdrdir)/ruby/backward/2/inttypes.h
 arity.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/notimplement/depend b/ext/-test-/notimplement/depend
index a7fe67b636..35bbf693b6 100644
--- a/ext/-test-/notimplement/depend
+++ b/ext/-test-/notimplement/depend
@@ -147,7 +147,6 @@ bug.o: $(hdrdir)/ruby/backward.h
 bug.o: $(hdrdir)/ruby/backward/2/assume.h
 bug.o: $(hdrdir)/ruby/backward/2/attributes.h
 bug.o: $(hdrdir)/ruby/backward/2/bool.h
-bug.o: $(hdrdir)/ruby/backward/2/extern.h
 bug.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bug.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bug.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/num2int/depend b/ext/-test-/num2int/depend
index 8c0f8d9d9d..d76314d5be 100644
--- a/ext/-test-/num2int/depend
+++ b/ext/-test-/num2int/depend
@@ -147,7 +147,6 @@ num2int.o: $(hdrdir)/ruby/backward.h
 num2int.o: $(hdrdir)/ruby/backward/2/assume.h
 num2int.o: $(hdrdir)/ruby/backward/2/attributes.h
 num2int.o: $(hdrdir)/ruby/backward/2/bool.h
-num2int.o: $(hdrdir)/ruby/backward/2/extern.h
 num2int.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 num2int.o: $(hdrdir)/ruby/backward/2/inttypes.h
 num2int.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/path_to_class/depend b/ext/-test-/path_to_class/depend
index ab243a9d15..13414309d1 100644
--- a/ext/-test-/path_to_class/depend
+++ b/ext/-test-/path_to_class/depend
@@ -147,7 +147,6 @@ path_to_class.o: $(hdrdir)/ruby/backward.h
 path_to_class.o: $(hdrdir)/ruby/backward/2/assume.h
 path_to_class.o: $(hdrdir)/ruby/backward/2/attributes.h
 path_to_class.o: $(hdrdir)/ruby/backward/2/bool.h
-path_to_class.o: $(hdrdir)/ruby/backward/2/extern.h
 path_to_class.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 path_to_class.o: $(hdrdir)/ruby/backward/2/inttypes.h
 path_to_class.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/popen_deadlock/depend b/ext/-test-/popen_deadlock/depend
index bda00fa500..ed1aef75d9 100644
--- a/ext/-test-/popen_deadlock/depend
+++ b/ext/-test-/popen_deadlock/depend
@@ -146,7 +146,6 @@ infinite_loop_dlsym.o: $(hdrdir)/ruby/backward.h
 infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/assume.h
 infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/attributes.h
 infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/bool.h
-infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/extern.h
 infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/inttypes.h
 infinite_loop_dlsym.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/postponed_job/depend b/ext/-test-/postponed_job/depend
index 337358909e..9f241fd2b8 100644
--- a/ext/-test-/postponed_job/depend
+++ b/ext/-test-/postponed_job/depend
@@ -147,7 +147,6 @@ postponed_job.o: $(hdrdir)/ruby/backward.h
 postponed_job.o: $(hdrdir)/ruby/backward/2/assume.h
 postponed_job.o: $(hdrdir)/ruby/backward/2/attributes.h
 postponed_job.o: $(hdrdir)/ruby/backward/2/bool.h
-postponed_job.o: $(hdrdir)/ruby/backward/2/extern.h
 postponed_job.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 postponed_job.o: $(hdrdir)/ruby/backward/2/inttypes.h
 postponed_job.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/printf/depend b/ext/-test-/printf/depend
index 47c5263ec9..aeae8bd935 100644
--- a/ext/-test-/printf/depend
+++ b/ext/-test-/printf/depend
@@ -147,7 +147,6 @@ printf.o: $(hdrdir)/ruby/backward.h
 printf.o: $(hdrdir)/ruby/backward/2/assume.h
 printf.o: $(hdrdir)/ruby/backward/2/attributes.h
 printf.o: $(hdrdir)/ruby/backward/2/bool.h
-printf.o: $(hdrdir)/ruby/backward/2/extern.h
 printf.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 printf.o: $(hdrdir)/ruby/backward/2/inttypes.h
 printf.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/proc/depend b/ext/-test-/proc/depend
index 73e5f562b1..c264f91835 100644
--- a/ext/-test-/proc/depend
+++ b/ext/-test-/proc/depend
@@ -147,7 +147,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ receiver.o: $(hdrdir)/ruby/backward.h
 receiver.o: $(hdrdir)/ruby/backward/2/assume.h
 receiver.o: $(hdrdir)/ruby/backward/2/attributes.h
 receiver.o: $(hdrdir)/ruby/backward/2/bool.h
-receiver.o: $(hdrdir)/ruby/backward/2/extern.h
 receiver.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 receiver.o: $(hdrdir)/ruby/backward/2/inttypes.h
 receiver.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -475,7 +473,6 @@ super.o: $(hdrdir)/ruby/backward.h
 super.o: $(hdrdir)/ruby/backward/2/assume.h
 super.o: $(hdrdir)/ruby/backward/2/attributes.h
 super.o: $(hdrdir)/ruby/backward/2/bool.h
-super.o: $(hdrdir)/ruby/backward/2/extern.h
 super.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 super.o: $(hdrdir)/ruby/backward/2/inttypes.h
 super.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/rational/depend b/ext/-test-/rational/depend
index bef9d2be5c..3123c26d15 100644
--- a/ext/-test-/rational/depend
+++ b/ext/-test-/rational/depend
@@ -151,7 +151,6 @@ rat.o: $(hdrdir)/ruby/backward.h
 rat.o: $(hdrdir)/ruby/backward/2/assume.h
 rat.o: $(hdrdir)/ruby/backward/2/attributes.h
 rat.o: $(hdrdir)/ruby/backward/2/bool.h
-rat.o: $(hdrdir)/ruby/backward/2/extern.h
 rat.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 rat.o: $(hdrdir)/ruby/backward/2/inttypes.h
 rat.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/rb_call_super_kw/depend b/ext/-test-/rb_call_super_kw/depend
index 6ce01908dc..b344f12851 100644
--- a/ext/-test-/rb_call_super_kw/depend
+++ b/ext/-test-/rb_call_super_kw/depend
@@ -147,7 +147,6 @@ rb_call_super_kw.o: $(hdrdir)/ruby/backward.h
 rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/assume.h
 rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/attributes.h
 rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/bool.h
-rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/extern.h
 rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/inttypes.h
 rb_call_super_kw.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/recursion/depend b/ext/-test-/recursion/depend
index 8fba9d9d52..451530bc08 100644
--- a/ext/-test-/recursion/depend
+++ b/ext/-test-/recursion/depend
@@ -147,7 +147,6 @@ recursion.o: $(hdrdir)/ruby/backward.h
 recursion.o: $(hdrdir)/ruby/backward/2/assume.h
 recursion.o: $(hdrdir)/ruby/backward/2/attributes.h
 recursion.o: $(hdrdir)/ruby/backward/2/bool.h
-recursion.o: $(hdrdir)/ruby/backward/2/extern.h
 recursion.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 recursion.o: $(hdrdir)/ruby/backward/2/inttypes.h
 recursion.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/regexp/depend b/ext/-test-/regexp/depend
index f071e6cea6..c38a43ced7 100644
--- a/ext/-test-/regexp/depend
+++ b/ext/-test-/regexp/depend
@@ -147,7 +147,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ parse_depth_limit.o: $(hdrdir)/ruby/backward.h
 parse_depth_limit.o: $(hdrdir)/ruby/backward/2/assume.h
 parse_depth_limit.o: $(hdrdir)/ruby/backward/2/attributes.h
 parse_depth_limit.o: $(hdrdir)/ruby/backward/2/bool.h
-parse_depth_limit.o: $(hdrdir)/ruby/backward/2/extern.h
 parse_depth_limit.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 parse_depth_limit.o: $(hdrdir)/ruby/backward/2/inttypes.h
 parse_depth_limit.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/scan_args/depend b/ext/-test-/scan_args/depend
index 4ddef9c6cf..9be66b6a1e 100644
--- a/ext/-test-/scan_args/depend
+++ b/ext/-test-/scan_args/depend
@@ -147,7 +147,6 @@ scan_args.o: $(hdrdir)/ruby/backward.h
 scan_args.o: $(hdrdir)/ruby/backward/2/assume.h
 scan_args.o: $(hdrdir)/ruby/backward/2/attributes.h
 scan_args.o: $(hdrdir)/ruby/backward/2/bool.h
-scan_args.o: $(hdrdir)/ruby/backward/2/extern.h
 scan_args.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 scan_args.o: $(hdrdir)/ruby/backward/2/inttypes.h
 scan_args.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/st/foreach/depend b/ext/-test-/st/foreach/depend
index e013ec77e3..6f9c8e0956 100644
--- a/ext/-test-/st/foreach/depend
+++ b/ext/-test-/st/foreach/depend
@@ -147,7 +147,6 @@ foreach.o: $(hdrdir)/ruby/backward.h
 foreach.o: $(hdrdir)/ruby/backward/2/assume.h
 foreach.o: $(hdrdir)/ruby/backward/2/attributes.h
 foreach.o: $(hdrdir)/ruby/backward/2/bool.h
-foreach.o: $(hdrdir)/ruby/backward/2/extern.h
 foreach.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 foreach.o: $(hdrdir)/ruby/backward/2/inttypes.h
 foreach.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/st/numhash/depend b/ext/-test-/st/numhash/depend
index 805eda783d..39f4068c22 100644
--- a/ext/-test-/st/numhash/depend
+++ b/ext/-test-/st/numhash/depend
@@ -147,7 +147,6 @@ numhash.o: $(hdrdir)/ruby/backward.h
 numhash.o: $(hdrdir)/ruby/backward/2/assume.h
 numhash.o: $(hdrdir)/ruby/backward/2/attributes.h
 numhash.o: $(hdrdir)/ruby/backward/2/bool.h
-numhash.o: $(hdrdir)/ruby/backward/2/extern.h
 numhash.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 numhash.o: $(hdrdir)/ruby/backward/2/inttypes.h
 numhash.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/st/update/depend b/ext/-test-/st/update/depend
index 0b4d8d863a..12bbe1341a 100644
--- a/ext/-test-/st/update/depend
+++ b/ext/-test-/st/update/depend
@@ -147,7 +147,6 @@ update.o: $(hdrdir)/ruby/backward.h
 update.o: $(hdrdir)/ruby/backward/2/assume.h
 update.o: $(hdrdir)/ruby/backward/2/attributes.h
 update.o: $(hdrdir)/ruby/backward/2/bool.h
-update.o: $(hdrdir)/ruby/backward/2/extern.h
 update.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 update.o: $(hdrdir)/ruby/backward/2/inttypes.h
 update.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/string/depend b/ext/-test-/string/depend
index 40725bcabc..34d0667c42 100644
--- a/ext/-test-/string/depend
+++ b/ext/-test-/string/depend
@@ -147,7 +147,6 @@ capacity.o: $(hdrdir)/ruby/backward.h
 capacity.o: $(hdrdir)/ruby/backward/2/assume.h
 capacity.o: $(hdrdir)/ruby/backward/2/attributes.h
 capacity.o: $(hdrdir)/ruby/backward/2/bool.h
-capacity.o: $(hdrdir)/ruby/backward/2/extern.h
 capacity.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 capacity.o: $(hdrdir)/ruby/backward/2/inttypes.h
 capacity.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -316,7 +315,6 @@ coderange.o: $(hdrdir)/ruby/backward.h
 coderange.o: $(hdrdir)/ruby/backward/2/assume.h
 coderange.o: $(hdrdir)/ruby/backward/2/attributes.h
 coderange.o: $(hdrdir)/ruby/backward/2/bool.h
-coderange.o: $(hdrdir)/ruby/backward/2/extern.h
 coderange.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 coderange.o: $(hdrdir)/ruby/backward/2/inttypes.h
 coderange.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -483,7 +481,6 @@ cstr.o: $(hdrdir)/ruby/backward.h
 cstr.o: $(hdrdir)/ruby/backward/2/assume.h
 cstr.o: $(hdrdir)/ruby/backward/2/attributes.h
 cstr.o: $(hdrdir)/ruby/backward/2/bool.h
-cstr.o: $(hdrdir)/ruby/backward/2/extern.h
 cstr.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 cstr.o: $(hdrdir)/ruby/backward/2/inttypes.h
 cstr.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -654,7 +651,6 @@ ellipsize.o: $(hdrdir)/ruby/backward.h
 ellipsize.o: $(hdrdir)/ruby/backward/2/assume.h
 ellipsize.o: $(hdrdir)/ruby/backward/2/attributes.h
 ellipsize.o: $(hdrdir)/ruby/backward/2/bool.h
-ellipsize.o: $(hdrdir)/ruby/backward/2/extern.h
 ellipsize.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ellipsize.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ellipsize.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -818,7 +814,6 @@ enc_associate.o: $(hdrdir)/ruby/backward.h
 enc_associate.o: $(hdrdir)/ruby/backward/2/assume.h
 enc_associate.o: $(hdrdir)/ruby/backward/2/attributes.h
 enc_associate.o: $(hdrdir)/ruby/backward/2/bool.h
-enc_associate.o: $(hdrdir)/ruby/backward/2/extern.h
 enc_associate.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 enc_associate.o: $(hdrdir)/ruby/backward/2/inttypes.h
 enc_associate.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -984,7 +979,6 @@ enc_str_buf_cat.o: $(hdrdir)/ruby/backward.h
 enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/assume.h
 enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/attributes.h
 enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/bool.h
-enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/extern.h
 enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/inttypes.h
 enc_str_buf_cat.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1151,7 +1145,6 @@ fstring.o: $(hdrdir)/ruby/backward.h
 fstring.o: $(hdrdir)/ruby/backward/2/assume.h
 fstring.o: $(hdrdir)/ruby/backward/2/attributes.h
 fstring.o: $(hdrdir)/ruby/backward/2/bool.h
-fstring.o: $(hdrdir)/ruby/backward/2/extern.h
 fstring.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 fstring.o: $(hdrdir)/ruby/backward/2/inttypes.h
 fstring.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1315,7 +1308,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1479,7 +1471,6 @@ modify.o: $(hdrdir)/ruby/backward.h
 modify.o: $(hdrdir)/ruby/backward/2/assume.h
 modify.o: $(hdrdir)/ruby/backward/2/attributes.h
 modify.o: $(hdrdir)/ruby/backward/2/bool.h
-modify.o: $(hdrdir)/ruby/backward/2/extern.h
 modify.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 modify.o: $(hdrdir)/ruby/backward/2/inttypes.h
 modify.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1643,7 +1634,6 @@ new.o: $(hdrdir)/ruby/backward.h
 new.o: $(hdrdir)/ruby/backward/2/assume.h
 new.o: $(hdrdir)/ruby/backward/2/attributes.h
 new.o: $(hdrdir)/ruby/backward/2/bool.h
-new.o: $(hdrdir)/ruby/backward/2/extern.h
 new.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 new.o: $(hdrdir)/ruby/backward/2/inttypes.h
 new.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1810,7 +1800,6 @@ nofree.o: $(hdrdir)/ruby/backward.h
 nofree.o: $(hdrdir)/ruby/backward/2/assume.h
 nofree.o: $(hdrdir)/ruby/backward/2/attributes.h
 nofree.o: $(hdrdir)/ruby/backward/2/bool.h
-nofree.o: $(hdrdir)/ruby/backward/2/extern.h
 nofree.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 nofree.o: $(hdrdir)/ruby/backward/2/inttypes.h
 nofree.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1974,7 +1963,6 @@ normalize.o: $(hdrdir)/ruby/backward.h
 normalize.o: $(hdrdir)/ruby/backward/2/assume.h
 normalize.o: $(hdrdir)/ruby/backward/2/attributes.h
 normalize.o: $(hdrdir)/ruby/backward/2/bool.h
-normalize.o: $(hdrdir)/ruby/backward/2/extern.h
 normalize.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 normalize.o: $(hdrdir)/ruby/backward/2/inttypes.h
 normalize.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2143,7 +2131,6 @@ qsort.o: $(hdrdir)/ruby/backward.h
 qsort.o: $(hdrdir)/ruby/backward/2/assume.h
 qsort.o: $(hdrdir)/ruby/backward/2/attributes.h
 qsort.o: $(hdrdir)/ruby/backward/2/bool.h
-qsort.o: $(hdrdir)/ruby/backward/2/extern.h
 qsort.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 qsort.o: $(hdrdir)/ruby/backward/2/inttypes.h
 qsort.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2311,7 +2298,6 @@ rb_str_dup.o: $(hdrdir)/ruby/backward.h
 rb_str_dup.o: $(hdrdir)/ruby/backward/2/assume.h
 rb_str_dup.o: $(hdrdir)/ruby/backward/2/attributes.h
 rb_str_dup.o: $(hdrdir)/ruby/backward/2/bool.h
-rb_str_dup.o: $(hdrdir)/ruby/backward/2/extern.h
 rb_str_dup.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 rb_str_dup.o: $(hdrdir)/ruby/backward/2/inttypes.h
 rb_str_dup.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2475,7 +2461,6 @@ set_len.o: $(hdrdir)/ruby/backward.h
 set_len.o: $(hdrdir)/ruby/backward/2/assume.h
 set_len.o: $(hdrdir)/ruby/backward/2/attributes.h
 set_len.o: $(hdrdir)/ruby/backward/2/bool.h
-set_len.o: $(hdrdir)/ruby/backward/2/extern.h
 set_len.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 set_len.o: $(hdrdir)/ruby/backward/2/inttypes.h
 set_len.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/struct/depend b/ext/-test-/struct/depend
index abfd2039b6..bf1449255d 100644
--- a/ext/-test-/struct/depend
+++ b/ext/-test-/struct/depend
@@ -147,7 +147,6 @@ duplicate.o: $(hdrdir)/ruby/backward.h
 duplicate.o: $(hdrdir)/ruby/backward/2/assume.h
 duplicate.o: $(hdrdir)/ruby/backward/2/attributes.h
 duplicate.o: $(hdrdir)/ruby/backward/2/bool.h
-duplicate.o: $(hdrdir)/ruby/backward/2/extern.h
 duplicate.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 duplicate.o: $(hdrdir)/ruby/backward/2/inttypes.h
 duplicate.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -475,7 +473,6 @@ len.o: $(hdrdir)/ruby/backward.h
 len.o: $(hdrdir)/ruby/backward/2/assume.h
 len.o: $(hdrdir)/ruby/backward/2/attributes.h
 len.o: $(hdrdir)/ruby/backward/2/bool.h
-len.o: $(hdrdir)/ruby/backward/2/extern.h
 len.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 len.o: $(hdrdir)/ruby/backward/2/inttypes.h
 len.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -639,7 +636,6 @@ member.o: $(hdrdir)/ruby/backward.h
 member.o: $(hdrdir)/ruby/backward/2/assume.h
 member.o: $(hdrdir)/ruby/backward/2/attributes.h
 member.o: $(hdrdir)/ruby/backward/2/bool.h
-member.o: $(hdrdir)/ruby/backward/2/extern.h
 member.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 member.o: $(hdrdir)/ruby/backward/2/inttypes.h
 member.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/symbol/depend b/ext/-test-/symbol/depend
index db6c123dde..7e19d9079b 100644
--- a/ext/-test-/symbol/depend
+++ b/ext/-test-/symbol/depend
@@ -147,7 +147,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ type.o: $(hdrdir)/ruby/backward.h
 type.o: $(hdrdir)/ruby/backward/2/assume.h
 type.o: $(hdrdir)/ruby/backward/2/attributes.h
 type.o: $(hdrdir)/ruby/backward/2/bool.h
-type.o: $(hdrdir)/ruby/backward/2/extern.h
 type.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 type.o: $(hdrdir)/ruby/backward/2/inttypes.h
 type.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/thread_fd_close/depend b/ext/-test-/thread_fd_close/depend
index 01a1039469..8e2880a7ee 100644
--- a/ext/-test-/thread_fd_close/depend
+++ b/ext/-test-/thread_fd_close/depend
@@ -146,7 +146,6 @@ thread_fd_close.o: $(hdrdir)/ruby/backward.h
 thread_fd_close.o: $(hdrdir)/ruby/backward/2/assume.h
 thread_fd_close.o: $(hdrdir)/ruby/backward/2/attributes.h
 thread_fd_close.o: $(hdrdir)/ruby/backward/2/bool.h
-thread_fd_close.o: $(hdrdir)/ruby/backward/2/extern.h
 thread_fd_close.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 thread_fd_close.o: $(hdrdir)/ruby/backward/2/inttypes.h
 thread_fd_close.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/time/depend b/ext/-test-/time/depend
index ca4d8c1a85..9a065982b8 100644
--- a/ext/-test-/time/depend
+++ b/ext/-test-/time/depend
@@ -147,7 +147,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -311,7 +310,6 @@ leap_second.o: $(hdrdir)/ruby/backward.h
 leap_second.o: $(hdrdir)/ruby/backward/2/assume.h
 leap_second.o: $(hdrdir)/ruby/backward/2/attributes.h
 leap_second.o: $(hdrdir)/ruby/backward/2/bool.h
-leap_second.o: $(hdrdir)/ruby/backward/2/extern.h
 leap_second.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 leap_second.o: $(hdrdir)/ruby/backward/2/inttypes.h
 leap_second.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -479,7 +477,6 @@ new.o: $(hdrdir)/ruby/backward.h
 new.o: $(hdrdir)/ruby/backward/2/assume.h
 new.o: $(hdrdir)/ruby/backward/2/attributes.h
 new.o: $(hdrdir)/ruby/backward/2/bool.h
-new.o: $(hdrdir)/ruby/backward/2/extern.h
 new.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 new.o: $(hdrdir)/ruby/backward/2/inttypes.h
 new.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/tracepoint/depend b/ext/-test-/tracepoint/depend
index 42dcc982b9..e9752362e4 100644
--- a/ext/-test-/tracepoint/depend
+++ b/ext/-test-/tracepoint/depend
@@ -146,7 +146,6 @@ gc_hook.o: $(hdrdir)/ruby/backward.h
 gc_hook.o: $(hdrdir)/ruby/backward/2/assume.h
 gc_hook.o: $(hdrdir)/ruby/backward/2/attributes.h
 gc_hook.o: $(hdrdir)/ruby/backward/2/bool.h
-gc_hook.o: $(hdrdir)/ruby/backward/2/extern.h
 gc_hook.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 gc_hook.o: $(hdrdir)/ruby/backward/2/inttypes.h
 gc_hook.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -310,7 +309,6 @@ tracepoint.o: $(hdrdir)/ruby/backward.h
 tracepoint.o: $(hdrdir)/ruby/backward/2/assume.h
 tracepoint.o: $(hdrdir)/ruby/backward/2/attributes.h
 tracepoint.o: $(hdrdir)/ruby/backward/2/bool.h
-tracepoint.o: $(hdrdir)/ruby/backward/2/extern.h
 tracepoint.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 tracepoint.o: $(hdrdir)/ruby/backward/2/inttypes.h
 tracepoint.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/typeddata/depend b/ext/-test-/typeddata/depend
index 9eb8632678..fff0c1f8e8 100644
--- a/ext/-test-/typeddata/depend
+++ b/ext/-test-/typeddata/depend
@@ -147,7 +147,6 @@ typeddata.o: $(hdrdir)/ruby/backward.h
 typeddata.o: $(hdrdir)/ruby/backward/2/assume.h
 typeddata.o: $(hdrdir)/ruby/backward/2/attributes.h
 typeddata.o: $(hdrdir)/ruby/backward/2/bool.h
-typeddata.o: $(hdrdir)/ruby/backward/2/extern.h
 typeddata.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 typeddata.o: $(hdrdir)/ruby/backward/2/inttypes.h
 typeddata.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/vm/depend b/ext/-test-/vm/depend
index 8b6ef54509..4b352130ed 100644
--- a/ext/-test-/vm/depend
+++ b/ext/-test-/vm/depend
@@ -146,7 +146,6 @@ at_exit.o: $(hdrdir)/ruby/backward.h
 at_exit.o: $(hdrdir)/ruby/backward/2/assume.h
 at_exit.o: $(hdrdir)/ruby/backward/2/attributes.h
 at_exit.o: $(hdrdir)/ruby/backward/2/bool.h
-at_exit.o: $(hdrdir)/ruby/backward/2/extern.h
 at_exit.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 at_exit.o: $(hdrdir)/ruby/backward/2/inttypes.h
 at_exit.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/-test-/wait_for_single_fd/depend b/ext/-test-/wait_for_single_fd/depend
index 62a2e04afd..298768b9ca 100644
--- a/ext/-test-/wait_for_single_fd/depend
+++ b/ext/-test-/wait_for_single_fd/depend
@@ -146,7 +146,6 @@ wait_for_single_fd.o: $(hdrdir)/ruby/backward.h
 wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/assume.h
 wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/attributes.h
 wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/bool.h
-wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/extern.h
 wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/inttypes.h
 wait_for_single_fd.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/bigdecimal/depend b/ext/bigdecimal/depend
index 33839e8bdb..48e0d623f2 100644
--- a/ext/bigdecimal/depend
+++ b/ext/bigdecimal/depend
@@ -148,7 +148,6 @@ bigdecimal.o: $(hdrdir)/ruby/assert.h
 bigdecimal.o: $(hdrdir)/ruby/backward/2/assume.h
 bigdecimal.o: $(hdrdir)/ruby/backward/2/attributes.h
 bigdecimal.o: $(hdrdir)/ruby/backward/2/bool.h
-bigdecimal.o: $(hdrdir)/ruby/backward/2/extern.h
 bigdecimal.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bigdecimal.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bigdecimal.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/cgi/escape/depend b/ext/cgi/escape/depend
index 4d52e5d1f9..d660e97a61 100644
--- a/ext/cgi/escape/depend
+++ b/ext/cgi/escape/depend
@@ -147,7 +147,6 @@ escape.o: $(hdrdir)/ruby/backward.h
 escape.o: $(hdrdir)/ruby/backward/2/assume.h
 escape.o: $(hdrdir)/ruby/backward/2/attributes.h
 escape.o: $(hdrdir)/ruby/backward/2/bool.h
-escape.o: $(hdrdir)/ruby/backward/2/extern.h
 escape.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 escape.o: $(hdrdir)/ruby/backward/2/inttypes.h
 escape.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/continuation/depend b/ext/continuation/depend
index 25fe958b2c..734152dda7 100644
--- a/ext/continuation/depend
+++ b/ext/continuation/depend
@@ -146,7 +146,6 @@ continuation.o: $(hdrdir)/ruby/backward.h
 continuation.o: $(hdrdir)/ruby/backward/2/assume.h
 continuation.o: $(hdrdir)/ruby/backward/2/attributes.h
 continuation.o: $(hdrdir)/ruby/backward/2/bool.h
-continuation.o: $(hdrdir)/ruby/backward/2/extern.h
 continuation.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 continuation.o: $(hdrdir)/ruby/backward/2/inttypes.h
 continuation.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/coverage/depend b/ext/coverage/depend
index a81fbcd937..74bdbdfe4f 100644
--- a/ext/coverage/depend
+++ b/ext/coverage/depend
@@ -147,7 +147,6 @@ coverage.o: $(hdrdir)/ruby/backward.h
 coverage.o: $(hdrdir)/ruby/backward/2/assume.h
 coverage.o: $(hdrdir)/ruby/backward/2/attributes.h
 coverage.o: $(hdrdir)/ruby/backward/2/bool.h
-coverage.o: $(hdrdir)/ruby/backward/2/extern.h
 coverage.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 coverage.o: $(hdrdir)/ruby/backward/2/inttypes.h
 coverage.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/date/depend b/ext/date/depend
index fa8f2503e0..0b66e52fab 100644
--- a/ext/date/depend
+++ b/ext/date/depend
@@ -147,7 +147,6 @@ date_core.o: $(hdrdir)/ruby/backward.h
 date_core.o: $(hdrdir)/ruby/backward/2/assume.h
 date_core.o: $(hdrdir)/ruby/backward/2/attributes.h
 date_core.o: $(hdrdir)/ruby/backward/2/bool.h
-date_core.o: $(hdrdir)/ruby/backward/2/extern.h
 date_core.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 date_core.o: $(hdrdir)/ruby/backward/2/inttypes.h
 date_core.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -317,7 +316,6 @@ date_parse.o: $(hdrdir)/ruby/backward.h
 date_parse.o: $(hdrdir)/ruby/backward/2/assume.h
 date_parse.o: $(hdrdir)/ruby/backward/2/attributes.h
 date_parse.o: $(hdrdir)/ruby/backward/2/bool.h
-date_parse.o: $(hdrdir)/ruby/backward/2/extern.h
 date_parse.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 date_parse.o: $(hdrdir)/ruby/backward/2/inttypes.h
 date_parse.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -487,7 +485,6 @@ date_strftime.o: $(hdrdir)/ruby/backward.h
 date_strftime.o: $(hdrdir)/ruby/backward/2/assume.h
 date_strftime.o: $(hdrdir)/ruby/backward/2/attributes.h
 date_strftime.o: $(hdrdir)/ruby/backward/2/bool.h
-date_strftime.o: $(hdrdir)/ruby/backward/2/extern.h
 date_strftime.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 date_strftime.o: $(hdrdir)/ruby/backward/2/inttypes.h
 date_strftime.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -653,7 +650,6 @@ date_strptime.o: $(hdrdir)/ruby/backward.h
 date_strptime.o: $(hdrdir)/ruby/backward/2/assume.h
 date_strptime.o: $(hdrdir)/ruby/backward/2/attributes.h
 date_strptime.o: $(hdrdir)/ruby/backward/2/bool.h
-date_strptime.o: $(hdrdir)/ruby/backward/2/extern.h
 date_strptime.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 date_strptime.o: $(hdrdir)/ruby/backward/2/inttypes.h
 date_strptime.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/dbm/depend b/ext/dbm/depend
index 485171ef0e..581a5c9d03 100644
--- a/ext/dbm/depend
+++ b/ext/dbm/depend
@@ -147,7 +147,6 @@ dbm.o: $(hdrdir)/ruby/backward.h
 dbm.o: $(hdrdir)/ruby/backward/2/assume.h
 dbm.o: $(hdrdir)/ruby/backward/2/attributes.h
 dbm.o: $(hdrdir)/ruby/backward/2/bool.h
-dbm.o: $(hdrdir)/ruby/backward/2/extern.h
 dbm.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 dbm.o: $(hdrdir)/ruby/backward/2/inttypes.h
 dbm.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/digest/bubblebabble/depend b/ext/digest/bubblebabble/depend
index 69d2e96ff5..173e6aefe4 100644
--- a/ext/digest/bubblebabble/depend
+++ b/ext/digest/bubblebabble/depend
@@ -147,7 +147,6 @@ bubblebabble.o: $(hdrdir)/ruby/backward.h
 bubblebabble.o: $(hdrdir)/ruby/backward/2/assume.h
 bubblebabble.o: $(hdrdir)/ruby/backward/2/attributes.h
 bubblebabble.o: $(hdrdir)/ruby/backward/2/bool.h
-bubblebabble.o: $(hdrdir)/ruby/backward/2/extern.h
 bubblebabble.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 bubblebabble.o: $(hdrdir)/ruby/backward/2/inttypes.h
 bubblebabble.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/digest/depend b/ext/digest/depend
index 797888326c..5e2d85be9d 100644
--- a/ext/digest/depend
+++ b/ext/digest/depend
@@ -147,7 +147,6 @@ digest.o: $(hdrdir)/ruby/backward.h
 digest.o: $(hdrdir)/ruby/backward/2/assume.h
 digest.o: $(hdrdir)/ruby/backward/2/attributes.h
 digest.o: $(hdrdir)/ruby/backward/2/bool.h
-digest.o: $(hdrdir)/ruby/backward/2/extern.h
 digest.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 digest.o: $(hdrdir)/ruby/backward/2/inttypes.h
 digest.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/digest/md5/depend b/ext/digest/md5/depend
index a428a05d66..cf893f2d53 100644
--- a/ext/digest/md5/depend
+++ b/ext/digest/md5/depend
@@ -150,7 +150,6 @@ md5init.o: $(hdrdir)/ruby/backward.h
 md5init.o: $(hdrdir)/ruby/backward/2/assume.h
 md5init.o: $(hdrdir)/ruby/backward/2/attributes.h
 md5init.o: $(hdrdir)/ruby/backward/2/bool.h
-md5init.o: $(hdrdir)/ruby/backward/2/extern.h
 md5init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 md5init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 md5init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/digest/rmd160/depend b/ext/digest/rmd160/depend
index f05b506598..e85b757f0e 100644
--- a/ext/digest/rmd160/depend
+++ b/ext/digest/rmd160/depend
@@ -150,7 +150,6 @@ rmd160init.o: $(hdrdir)/ruby/backward.h
 rmd160init.o: $(hdrdir)/ruby/backward/2/assume.h
 rmd160init.o: $(hdrdir)/ruby/backward/2/attributes.h
 rmd160init.o: $(hdrdir)/ruby/backward/2/bool.h
-rmd160init.o: $(hdrdir)/ruby/backward/2/extern.h
 rmd160init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 rmd160init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 rmd160init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/digest/sha1/depend b/ext/digest/sha1/depend
index 4af4d2e08e..557421cdb2 100644
--- a/ext/digest/sha1/depend
+++ b/ext/digest/sha1/depend
@@ -150,7 +150,6 @@ sha1init.o: $(hdrdir)/ruby/backward.h
 sha1init.o: $(hdrdir)/ruby/backward/2/assume.h
 sha1init.o: $(hdrdir)/ruby/backward/2/attributes.h
 sha1init.o: $(hdrdir)/ruby/backward/2/bool.h
-sha1init.o: $(hdrdir)/ruby/backward/2/extern.h
 sha1init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 sha1init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 sha1init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/digest/sha2/depend b/ext/digest/sha2/depend
index 437b00d337..c003c5948f 100644
--- a/ext/digest/sha2/depend
+++ b/ext/digest/sha2/depend
@@ -150,7 +150,6 @@ sha2init.o: $(hdrdir)/ruby/backward.h
 sha2init.o: $(hdrdir)/ruby/backward/2/assume.h
 sha2init.o: $(hdrdir)/ruby/backward/2/attributes.h
 sha2init.o: $(hdrdir)/ruby/backward/2/bool.h
-sha2init.o: $(hdrdir)/ruby/backward/2/extern.h
 sha2init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 sha2init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 sha2init.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/etc/depend b/ext/etc/depend
index ce9c2941c9..c96a4e4f71 100644
--- a/ext/etc/depend
+++ b/ext/etc/depend
@@ -151,7 +151,6 @@ etc.o: $(hdrdir)/ruby/backward.h
 etc.o: $(hdrdir)/ruby/backward/2/assume.h
 etc.o: $(hdrdir)/ruby/backward/2/attributes.h
 etc.o: $(hdrdir)/ruby/backward/2/bool.h
-etc.o: $(hdrdir)/ruby/backward/2/extern.h
 etc.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 etc.o: $(hdrdir)/ruby/backward/2/inttypes.h
 etc.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/fcntl/depend b/ext/fcntl/depend
index a4fe489b51..e9ffd53763 100644
--- a/ext/fcntl/depend
+++ b/ext/fcntl/depend
@@ -147,7 +147,6 @@ fcntl.o: $(hdrdir)/ruby/backward.h
 fcntl.o: $(hdrdir)/ruby/backward/2/assume.h
 fcntl.o: $(hdrdir)/ruby/backward/2/attributes.h
 fcntl.o: $(hdrdir)/ruby/backward/2/bool.h
-fcntl.o: $(hdrdir)/ruby/backward/2/extern.h
 fcntl.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 fcntl.o: $(hdrdir)/ruby/backward/2/inttypes.h
 fcntl.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/fiddle/depend b/ext/fiddle/depend
index ac812a7517..0014ed5e0d 100644
--- a/ext/fiddle/depend
+++ b/ext/fiddle/depend
@@ -200,7 +200,6 @@ closure.o: $(hdrdir)/ruby/backward.h
 closure.o: $(hdrdir)/ruby/backward/2/assume.h
 closure.o: $(hdrdir)/ruby/backward/2/attributes.h
 closure.o: $(hdrdir)/ruby/backward/2/bool.h
-closure.o: $(hdrdir)/ruby/backward/2/extern.h
 closure.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 closure.o: $(hdrdir)/ruby/backward/2/inttypes.h
 closure.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -369,7 +368,6 @@ conversions.o: $(hdrdir)/ruby/backward.h
 conversions.o: $(hdrdir)/ruby/backward/2/assume.h
 conversions.o: $(hdrdir)/ruby/backward/2/attributes.h
 conversions.o: $(hdrdir)/ruby/backward/2/bool.h
-conversions.o: $(hdrdir)/ruby/backward/2/extern.h
 conversions.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 conversions.o: $(hdrdir)/ruby/backward/2/inttypes.h
 conversions.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -537,7 +535,6 @@ fiddle.o: $(hdrdir)/ruby/backward.h
 fiddle.o: $(hdrdir)/ruby/backward/2/assume.h
 fiddle.o: $(hdrdir)/ruby/backward/2/attributes.h
 fiddle.o: $(hdrdir)/ruby/backward/2/bool.h
-fiddle.o: $(hdrdir)/ruby/backward/2/extern.h
 fiddle.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 fiddle.o: $(hdrdir)/ruby/backward/2/inttypes.h
 fiddle.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -705,7 +702,6 @@ function.o: $(hdrdir)/ruby/backward.h
 function.o: $(hdrdir)/ruby/backward/2/assume.h
 function.o: $(hdrdir)/ruby/backward/2/attributes.h
 function.o: $(hdrdir)/ruby/backward/2/bool.h
-function.o: $(hdrdir)/ruby/backward/2/extern.h
 function.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 function.o: $(hdrdir)/ruby/backward/2/inttypes.h
 function.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -874,7 +870,6 @@ handle.o: $(hdrdir)/ruby/backward.h
 handle.o: $(hdrdir)/ruby/backward/2/assume.h
 handle.o: $(hdrdir)/ruby/backward/2/attributes.h
 handle.o: $(hdrdir)/ruby/backward/2/bool.h
-handle.o: $(hdrdir)/ruby/backward/2/extern.h
 handle.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 handle.o: $(hdrdir)/ruby/backward/2/inttypes.h
 handle.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1042,7 +1037,6 @@ pointer.o: $(hdrdir)/ruby/backward.h
 pointer.o: $(hdrdir)/ruby/backward/2/assume.h
 pointer.o: $(hdrdir)/ruby/backward/2/attributes.h
 pointer.o: $(hdrdir)/ruby/backward/2/bool.h
-pointer.o: $(hdrdir)/ruby/backward/2/extern.h
 pointer.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 pointer.o: $(hdrdir)/ruby/backward/2/inttypes.h
 pointer.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/gdbm/depend b/ext/gdbm/depend
index d481e98656..7c87f50b9e 100644
--- a/ext/gdbm/depend
+++ b/ext/gdbm/depend
@@ -147,7 +147,6 @@ gdbm.o: $(hdrdir)/ruby/backward.h
 gdbm.o: $(hdrdir)/ruby/backward/2/assume.h
 gdbm.o: $(hdrdir)/ruby/backward/2/attributes.h
 gdbm.o: $(hdrdir)/ruby/backward/2/bool.h
-gdbm.o: $(hdrdir)/ruby/backward/2/extern.h
 gdbm.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 gdbm.o: $(hdrdir)/ruby/backward/2/inttypes.h
 gdbm.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/io/console/depend b/ext/io/console/depend
index 4beb337020..888e1a9df3 100644
--- a/ext/io/console/depend
+++ b/ext/io/console/depend
@@ -147,7 +147,6 @@ console.o: $(hdrdir)/ruby/backward.h
 console.o: $(hdrdir)/ruby/backward/2/assume.h
 console.o: $(hdrdir)/ruby/backward/2/attributes.h
 console.o: $(hdrdir)/ruby/backward/2/bool.h
-console.o: $(hdrdir)/ruby/backward/2/extern.h
 console.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 console.o: $(hdrdir)/ruby/backward/2/inttypes.h
 console.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/io/nonblock/depend b/ext/io/nonblock/depend
index 75157eae4b..701177aa2e 100644
--- a/ext/io/nonblock/depend
+++ b/ext/io/nonblock/depend
@@ -147,7 +147,6 @@ nonblock.o: $(hdrdir)/ruby/backward.h
 nonblock.o: $(hdrdir)/ruby/backward/2/assume.h
 nonblock.o: $(hdrdir)/ruby/backward/2/attributes.h
 nonblock.o: $(hdrdir)/ruby/backward/2/bool.h
-nonblock.o: $(hdrdir)/ruby/backward/2/extern.h
 nonblock.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 nonblock.o: $(hdrdir)/ruby/backward/2/inttypes.h
 nonblock.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/io/wait/depend b/ext/io/wait/depend
index b735708a9d..dc3d368aac 100644
--- a/ext/io/wait/depend
+++ b/ext/io/wait/depend
@@ -147,7 +147,6 @@ wait.o: $(hdrdir)/ruby/backward.h
 wait.o: $(hdrdir)/ruby/backward/2/assume.h
 wait.o: $(hdrdir)/ruby/backward/2/attributes.h
 wait.o: $(hdrdir)/ruby/backward/2/bool.h
-wait.o: $(hdrdir)/ruby/backward/2/extern.h
 wait.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 wait.o: $(hdrdir)/ruby/backward/2/inttypes.h
 wait.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/json/generator/depend b/ext/json/generator/depend
index 4362661092..2c6f1436e4 100644
--- a/ext/json/generator/depend
+++ b/ext/json/generator/depend
@@ -151,7 +151,6 @@ generator.o: $(hdrdir)/ruby/backward.h
 generator.o: $(hdrdir)/ruby/backward/2/assume.h
 generator.o: $(hdrdir)/ruby/backward/2/attributes.h
 generator.o: $(hdrdir)/ruby/backward/2/bool.h
-generator.o: $(hdrdir)/ruby/backward/2/extern.h
 generator.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 generator.o: $(hdrdir)/ruby/backward/2/inttypes.h
 generator.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/json/parser/depend b/ext/json/parser/depend
index 04020a239f..6c972d2c5f 100644
--- a/ext/json/parser/depend
+++ b/ext/json/parser/depend
@@ -150,7 +150,6 @@ parser.o: $(hdrdir)/ruby/backward.h
 parser.o: $(hdrdir)/ruby/backward/2/assume.h
 parser.o: $(hdrdir)/ruby/backward/2/attributes.h
 parser.o: $(hdrdir)/ruby/backward/2/bool.h
-parser.o: $(hdrdir)/ruby/backward/2/extern.h
 parser.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 parser.o: $(hdrdir)/ruby/backward/2/inttypes.h
 parser.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/monitor/depend b/ext/monitor/depend
index 44b5616a61..6616bd2f32 100644
--- a/ext/monitor/depend
+++ b/ext/monitor/depend
@@ -146,7 +146,6 @@ monitor.o: $(hdrdir)/ruby/backward.h
 monitor.o: $(hdrdir)/ruby/backward/2/assume.h
 monitor.o: $(hdrdir)/ruby/backward/2/attributes.h
 monitor.o: $(hdrdir)/ruby/backward/2/bool.h
-monitor.o: $(hdrdir)/ruby/backward/2/extern.h
 monitor.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 monitor.o: $(hdrdir)/ruby/backward/2/inttypes.h
 monitor.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/nkf/depend b/ext/nkf/depend
index 0e1a590687..2a045ae229 100644
--- a/ext/nkf/depend
+++ b/ext/nkf/depend
@@ -150,7 +150,6 @@ nkf.o: $(hdrdir)/ruby/backward.h
 nkf.o: $(hdrdir)/ruby/backward/2/assume.h
 nkf.o: $(hdrdir)/ruby/backward/2/attributes.h
 nkf.o: $(hdrdir)/ruby/backward/2/bool.h
-nkf.o: $(hdrdir)/ruby/backward/2/extern.h
 nkf.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 nkf.o: $(hdrdir)/ruby/backward/2/inttypes.h
 nkf.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/objspace/depend b/ext/objspace/depend
index f2e77ff4db..a04550ecb3 100644
--- a/ext/objspace/depend
+++ b/ext/objspace/depend
@@ -147,7 +147,6 @@ object_tracing.o: $(hdrdir)/ruby/backward.h
 object_tracing.o: $(hdrdir)/ruby/backward/2/assume.h
 object_tracing.o: $(hdrdir)/ruby/backward/2/attributes.h
 object_tracing.o: $(hdrdir)/ruby/backward/2/bool.h
-object_tracing.o: $(hdrdir)/ruby/backward/2/extern.h
 object_tracing.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 object_tracing.o: $(hdrdir)/ruby/backward/2/inttypes.h
 object_tracing.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -315,7 +314,6 @@ objspace.o: $(hdrdir)/ruby/backward.h
 objspace.o: $(hdrdir)/ruby/backward/2/assume.h
 objspace.o: $(hdrdir)/ruby/backward/2/attributes.h
 objspace.o: $(hdrdir)/ruby/backward/2/bool.h
-objspace.o: $(hdrdir)/ruby/backward/2/extern.h
 objspace.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 objspace.o: $(hdrdir)/ruby/backward/2/inttypes.h
 objspace.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -500,7 +498,6 @@ objspace_dump.o: $(hdrdir)/ruby/backward.h
 objspace_dump.o: $(hdrdir)/ruby/backward/2/assume.h
 objspace_dump.o: $(hdrdir)/ruby/backward/2/attributes.h
 objspace_dump.o: $(hdrdir)/ruby/backward/2/bool.h
-objspace_dump.o: $(hdrdir)/ruby/backward/2/extern.h
 objspace_dump.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 objspace_dump.o: $(hdrdir)/ruby/backward/2/inttypes.h
 objspace_dump.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/openssl/depend b/ext/openssl/depend
index db84cc8731..a5584b3a49 100644
--- a/ext/openssl/depend
+++ b/ext/openssl/depend
@@ -151,7 +151,6 @@ ossl.o: $(hdrdir)/ruby/backward.h
 ossl.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -342,7 +341,6 @@ ossl_asn1.o: $(hdrdir)/ruby/backward.h
 ossl_asn1.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_asn1.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_asn1.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_asn1.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_asn1.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_asn1.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_asn1.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -532,7 +530,6 @@ ossl_bio.o: $(hdrdir)/ruby/backward.h
 ossl_bio.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_bio.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_bio.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_bio.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_bio.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_bio.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_bio.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -722,7 +719,6 @@ ossl_bn.o: $(hdrdir)/ruby/backward.h
 ossl_bn.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_bn.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_bn.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_bn.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_bn.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_bn.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_bn.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -912,7 +908,6 @@ ossl_cipher.o: $(hdrdir)/ruby/backward.h
 ossl_cipher.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_cipher.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_cipher.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_cipher.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_cipher.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_cipher.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_cipher.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1102,7 +1097,6 @@ ossl_config.o: $(hdrdir)/ruby/backward.h
 ossl_config.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_config.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_config.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_config.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_config.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_config.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_config.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1292,7 +1286,6 @@ ossl_digest.o: $(hdrdir)/ruby/backward.h
 ossl_digest.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_digest.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_digest.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_digest.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_digest.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_digest.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_digest.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1482,7 +1475,6 @@ ossl_engine.o: $(hdrdir)/ruby/backward.h
 ossl_engine.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_engine.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_engine.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_engine.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_engine.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_engine.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_engine.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1672,7 +1664,6 @@ ossl_hmac.o: $(hdrdir)/ruby/backward.h
 ossl_hmac.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_hmac.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_hmac.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_hmac.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_hmac.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_hmac.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_hmac.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1862,7 +1853,6 @@ ossl_kdf.o: $(hdrdir)/ruby/backward.h
 ossl_kdf.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_kdf.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_kdf.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_kdf.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_kdf.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_kdf.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_kdf.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2052,7 +2042,6 @@ ossl_ns_spki.o: $(hdrdir)/ruby/backward.h
 ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_ns_spki.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2242,7 +2231,6 @@ ossl_ocsp.o: $(hdrdir)/ruby/backward.h
 ossl_ocsp.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_ocsp.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_ocsp.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_ocsp.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_ocsp.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_ocsp.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_ocsp.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2432,7 +2420,6 @@ ossl_pkcs12.o: $(hdrdir)/ruby/backward.h
 ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkcs12.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2622,7 +2609,6 @@ ossl_pkcs7.o: $(hdrdir)/ruby/backward.h
 ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkcs7.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2812,7 +2798,6 @@ ossl_pkey.o: $(hdrdir)/ruby/backward.h
 ossl_pkey.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkey.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkey.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkey.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkey.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkey.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkey.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -3002,7 +2987,6 @@ ossl_pkey_dh.o: $(hdrdir)/ruby/backward.h
 ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkey_dh.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -3192,7 +3176,6 @@ ossl_pkey_dsa.o: $(hdrdir)/ruby/backward.h
 ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkey_dsa.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -3382,7 +3365,6 @@ ossl_pkey_ec.o: $(hdrdir)/ruby/backward.h
 ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkey_ec.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -3572,7 +3554,6 @@ ossl_pkey_rsa.o: $(hdrdir)/ruby/backward.h
 ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_pkey_rsa.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -3762,7 +3743,6 @@ ossl_rand.o: $(hdrdir)/ruby/backward.h
 ossl_rand.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_rand.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_rand.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_rand.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_rand.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_rand.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_rand.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -3952,7 +3932,6 @@ ossl_ssl.o: $(hdrdir)/ruby/backward.h
 ossl_ssl.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_ssl.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_ssl.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_ssl.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_ssl.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_ssl.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_ssl.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -4142,7 +4121,6 @@ ossl_ssl_session.o: $(hdrdir)/ruby/backward.h
 ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_ssl_session.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -4332,7 +4310,6 @@ ossl_ts.o: $(hdrdir)/ruby/backward.h
 ossl_ts.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_ts.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_ts.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_ts.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_ts.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_ts.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_ts.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -4522,7 +4499,6 @@ ossl_x509.o: $(hdrdir)/ruby/backward.h
 ossl_x509.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -4712,7 +4688,6 @@ ossl_x509attr.o: $(hdrdir)/ruby/backward.h
 ossl_x509attr.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509attr.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509attr.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509attr.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509attr.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509attr.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509attr.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -4902,7 +4877,6 @@ ossl_x509cert.o: $(hdrdir)/ruby/backward.h
 ossl_x509cert.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509cert.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509cert.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509cert.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509cert.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509cert.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509cert.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -5092,7 +5066,6 @@ ossl_x509crl.o: $(hdrdir)/ruby/backward.h
 ossl_x509crl.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509crl.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509crl.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509crl.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509crl.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509crl.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509crl.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -5282,7 +5255,6 @@ ossl_x509ext.o: $(hdrdir)/ruby/backward.h
 ossl_x509ext.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509ext.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509ext.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509ext.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509ext.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509ext.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509ext.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -5472,7 +5444,6 @@ ossl_x509name.o: $(hdrdir)/ruby/backward.h
 ossl_x509name.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509name.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509name.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509name.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509name.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509name.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509name.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -5662,7 +5633,6 @@ ossl_x509req.o: $(hdrdir)/ruby/backward.h
 ossl_x509req.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509req.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509req.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509req.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509req.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509req.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509req.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -5852,7 +5822,6 @@ ossl_x509revoked.o: $(hdrdir)/ruby/backward.h
 ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509revoked.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -6042,7 +6011,6 @@ ossl_x509store.o: $(hdrdir)/ruby/backward.h
 ossl_x509store.o: $(hdrdir)/ruby/backward/2/assume.h
 ossl_x509store.o: $(hdrdir)/ruby/backward/2/attributes.h
 ossl_x509store.o: $(hdrdir)/ruby/backward/2/bool.h
-ossl_x509store.o: $(hdrdir)/ruby/backward/2/extern.h
 ossl_x509store.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ossl_x509store.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ossl_x509store.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/pathname/depend b/ext/pathname/depend
index 6716fcd107..e237e36ebd 100644
--- a/ext/pathname/depend
+++ b/ext/pathname/depend
@@ -147,7 +147,6 @@ pathname.o: $(hdrdir)/ruby/backward.h
 pathname.o: $(hdrdir)/ruby/backward/2/assume.h
 pathname.o: $(hdrdir)/ruby/backward/2/attributes.h
 pathname.o: $(hdrdir)/ruby/backward/2/bool.h
-pathname.o: $(hdrdir)/ruby/backward/2/extern.h
 pathname.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 pathname.o: $(hdrdir)/ruby/backward/2/inttypes.h
 pathname.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/psych/depend b/ext/psych/depend
index 8aa8063f45..a98bdf8e71 100644
--- a/ext/psych/depend
+++ b/ext/psych/depend
@@ -149,7 +149,6 @@ psych.o: $(hdrdir)/ruby/backward.h
 psych.o: $(hdrdir)/ruby/backward/2/assume.h
 psych.o: $(hdrdir)/ruby/backward/2/attributes.h
 psych.o: $(hdrdir)/ruby/backward/2/bool.h
-psych.o: $(hdrdir)/ruby/backward/2/extern.h
 psych.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 psych.o: $(hdrdir)/ruby/backward/2/inttypes.h
 psych.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -321,7 +320,6 @@ psych_emitter.o: $(hdrdir)/ruby/backward.h
 psych_emitter.o: $(hdrdir)/ruby/backward/2/assume.h
 psych_emitter.o: $(hdrdir)/ruby/backward/2/attributes.h
 psych_emitter.o: $(hdrdir)/ruby/backward/2/bool.h
-psych_emitter.o: $(hdrdir)/ruby/backward/2/extern.h
 psych_emitter.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 psych_emitter.o: $(hdrdir)/ruby/backward/2/inttypes.h
 psych_emitter.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -493,7 +491,6 @@ psych_parser.o: $(hdrdir)/ruby/backward.h
 psych_parser.o: $(hdrdir)/ruby/backward/2/assume.h
 psych_parser.o: $(hdrdir)/ruby/backward/2/attributes.h
 psych_parser.o: $(hdrdir)/ruby/backward/2/bool.h
-psych_parser.o: $(hdrdir)/ruby/backward/2/extern.h
 psych_parser.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 psych_parser.o: $(hdrdir)/ruby/backward/2/inttypes.h
 psych_parser.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -665,7 +662,6 @@ psych_to_ruby.o: $(hdrdir)/ruby/backward.h
 psych_to_ruby.o: $(hdrdir)/ruby/backward/2/assume.h
 psych_to_ruby.o: $(hdrdir)/ruby/backward/2/attributes.h
 psych_to_ruby.o: $(hdrdir)/ruby/backward/2/bool.h
-psych_to_ruby.o: $(hdrdir)/ruby/backward/2/extern.h
 psych_to_ruby.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 psych_to_ruby.o: $(hdrdir)/ruby/backward/2/inttypes.h
 psych_to_ruby.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -837,7 +833,6 @@ psych_yaml_tree.o: $(hdrdir)/ruby/backward.h
 psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/assume.h
 psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/attributes.h
 psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/bool.h
-psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/extern.h
 psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/inttypes.h
 psych_yaml_tree.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/pty/depend b/ext/pty/depend
index bbbbdf42b8..79b6a56d4f 100644
--- a/ext/pty/depend
+++ b/ext/pty/depend
@@ -147,7 +147,6 @@ pty.o: $(hdrdir)/ruby/backward.h
 pty.o: $(hdrdir)/ruby/backward/2/assume.h
 pty.o: $(hdrdir)/ruby/backward/2/attributes.h
 pty.o: $(hdrdir)/ruby/backward/2/bool.h
-pty.o: $(hdrdir)/ruby/backward/2/extern.h
 pty.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 pty.o: $(hdrdir)/ruby/backward/2/inttypes.h
 pty.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/racc/cparse/depend b/ext/racc/cparse/depend
index fb722acc95..695425acfb 100644
--- a/ext/racc/cparse/depend
+++ b/ext/racc/cparse/depend
@@ -147,7 +147,6 @@ cparse.o: $(hdrdir)/ruby/backward.h
 cparse.o: $(hdrdir)/ruby/backward/2/assume.h
 cparse.o: $(hdrdir)/ruby/backward/2/attributes.h
 cparse.o: $(hdrdir)/ruby/backward/2/bool.h
-cparse.o: $(hdrdir)/ruby/backward/2/extern.h
 cparse.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 cparse.o: $(hdrdir)/ruby/backward/2/inttypes.h
 cparse.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/rbconfig/sizeof/depend b/ext/rbconfig/sizeof/depend
index b68c9bf70d..8b6b409550 100644
--- a/ext/rbconfig/sizeof/depend
+++ b/ext/rbconfig/sizeof/depend
@@ -161,7 +161,6 @@ limits.o: $(hdrdir)/ruby/backward.h
 limits.o: $(hdrdir)/ruby/backward/2/assume.h
 limits.o: $(hdrdir)/ruby/backward/2/attributes.h
 limits.o: $(hdrdir)/ruby/backward/2/bool.h
-limits.o: $(hdrdir)/ruby/backward/2/extern.h
 limits.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 limits.o: $(hdrdir)/ruby/backward/2/inttypes.h
 limits.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -324,7 +323,6 @@ sizes.o: $(hdrdir)/ruby/backward.h
 sizes.o: $(hdrdir)/ruby/backward/2/assume.h
 sizes.o: $(hdrdir)/ruby/backward/2/attributes.h
 sizes.o: $(hdrdir)/ruby/backward/2/bool.h
-sizes.o: $(hdrdir)/ruby/backward/2/extern.h
 sizes.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 sizes.o: $(hdrdir)/ruby/backward/2/inttypes.h
 sizes.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/readline/depend b/ext/readline/depend
index 02bf9beb70..9bc1bcfa3c 100644
--- a/ext/readline/depend
+++ b/ext/readline/depend
@@ -146,7 +146,6 @@ readline.o: $(hdrdir)/ruby/backward.h
 readline.o: $(hdrdir)/ruby/backward/2/assume.h
 readline.o: $(hdrdir)/ruby/backward/2/attributes.h
 readline.o: $(hdrdir)/ruby/backward/2/bool.h
-readline.o: $(hdrdir)/ruby/backward/2/extern.h
 readline.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 readline.o: $(hdrdir)/ruby/backward/2/inttypes.h
 readline.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/ripper/depend b/ext/ripper/depend
index fec60fa687..7f4f39ee02 100644
--- a/ext/ripper/depend
+++ b/ext/ripper/depend
@@ -197,7 +197,6 @@ ripper.o: $(hdrdir)/ruby/backward.h
 ripper.o: $(hdrdir)/ruby/backward/2/assume.h
 ripper.o: $(hdrdir)/ruby/backward/2/attributes.h
 ripper.o: $(hdrdir)/ruby/backward/2/bool.h
-ripper.o: $(hdrdir)/ruby/backward/2/extern.h
 ripper.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ripper.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ripper.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/socket/depend b/ext/socket/depend
index e4e4b0809a..e08283786d 100644
--- a/ext/socket/depend
+++ b/ext/socket/depend
@@ -158,7 +158,6 @@ ancdata.o: $(hdrdir)/ruby/backward.h
 ancdata.o: $(hdrdir)/ruby/backward/2/assume.h
 ancdata.o: $(hdrdir)/ruby/backward/2/attributes.h
 ancdata.o: $(hdrdir)/ruby/backward/2/bool.h
-ancdata.o: $(hdrdir)/ruby/backward/2/extern.h
 ancdata.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ancdata.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ancdata.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -343,7 +342,6 @@ basicsocket.o: $(hdrdir)/ruby/backward.h
 basicsocket.o: $(hdrdir)/ruby/backward/2/assume.h
 basicsocket.o: $(hdrdir)/ruby/backward/2/attributes.h
 basicsocket.o: $(hdrdir)/ruby/backward/2/bool.h
-basicsocket.o: $(hdrdir)/ruby/backward/2/extern.h
 basicsocket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 basicsocket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 basicsocket.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -528,7 +526,6 @@ constants.o: $(hdrdir)/ruby/backward.h
 constants.o: $(hdrdir)/ruby/backward/2/assume.h
 constants.o: $(hdrdir)/ruby/backward/2/attributes.h
 constants.o: $(hdrdir)/ruby/backward/2/bool.h
-constants.o: $(hdrdir)/ruby/backward/2/extern.h
 constants.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 constants.o: $(hdrdir)/ruby/backward/2/inttypes.h
 constants.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -714,7 +711,6 @@ ifaddr.o: $(hdrdir)/ruby/backward.h
 ifaddr.o: $(hdrdir)/ruby/backward/2/assume.h
 ifaddr.o: $(hdrdir)/ruby/backward/2/attributes.h
 ifaddr.o: $(hdrdir)/ruby/backward/2/bool.h
-ifaddr.o: $(hdrdir)/ruby/backward/2/extern.h
 ifaddr.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ifaddr.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ifaddr.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -899,7 +895,6 @@ init.o: $(hdrdir)/ruby/backward.h
 init.o: $(hdrdir)/ruby/backward/2/assume.h
 init.o: $(hdrdir)/ruby/backward/2/attributes.h
 init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
 init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 init.o: $(hdrdir)/ruby/backward/2/inttypes.h
 init.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1084,7 +1079,6 @@ ipsocket.o: $(hdrdir)/ruby/backward.h
 ipsocket.o: $(hdrdir)/ruby/backward/2/assume.h
 ipsocket.o: $(hdrdir)/ruby/backward/2/attributes.h
 ipsocket.o: $(hdrdir)/ruby/backward/2/bool.h
-ipsocket.o: $(hdrdir)/ruby/backward/2/extern.h
 ipsocket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 ipsocket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 ipsocket.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1269,7 +1263,6 @@ option.o: $(hdrdir)/ruby/backward.h
 option.o: $(hdrdir)/ruby/backward/2/assume.h
 option.o: $(hdrdir)/ruby/backward/2/attributes.h
 option.o: $(hdrdir)/ruby/backward/2/bool.h
-option.o: $(hdrdir)/ruby/backward/2/extern.h
 option.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 option.o: $(hdrdir)/ruby/backward/2/inttypes.h
 option.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1454,7 +1447,6 @@ raddrinfo.o: $(hdrdir)/ruby/backward.h
 raddrinfo.o: $(hdrdir)/ruby/backward/2/assume.h
 raddrinfo.o: $(hdrdir)/ruby/backward/2/attributes.h
 raddrinfo.o: $(hdrdir)/ruby/backward/2/bool.h
-raddrinfo.o: $(hdrdir)/ruby/backward/2/extern.h
 raddrinfo.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 raddrinfo.o: $(hdrdir)/ruby/backward/2/inttypes.h
 raddrinfo.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1639,7 +1631,6 @@ socket.o: $(hdrdir)/ruby/backward.h
 socket.o: $(hdrdir)/ruby/backward/2/assume.h
 socket.o: $(hdrdir)/ruby/backward/2/attributes.h
 socket.o: $(hdrdir)/ruby/backward/2/bool.h
-socket.o: $(hdrdir)/ruby/backward/2/extern.h
 socket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 socket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 socket.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -1824,7 +1815,6 @@ sockssocket.o: $(hdrdir)/ruby/backward.h
 sockssocket.o: $(hdrdir)/ruby/backward/2/assume.h
 sockssocket.o: $(hdrdir)/ruby/backward/2/attributes.h
 sockssocket.o: $(hdrdir)/ruby/backward/2/bool.h
-sockssocket.o: $(hdrdir)/ruby/backward/2/extern.h
 sockssocket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 sockssocket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 sockssocket.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2009,7 +1999,6 @@ tcpserver.o: $(hdrdir)/ruby/backward.h
 tcpserver.o: $(hdrdir)/ruby/backward/2/assume.h
 tcpserver.o: $(hdrdir)/ruby/backward/2/attributes.h
 tcpserver.o: $(hdrdir)/ruby/backward/2/bool.h
-tcpserver.o: $(hdrdir)/ruby/backward/2/extern.h
 tcpserver.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 tcpserver.o: $(hdrdir)/ruby/backward/2/inttypes.h
 tcpserver.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2194,7 +2183,6 @@ tcpsocket.o: $(hdrdir)/ruby/backward.h
 tcpsocket.o: $(hdrdir)/ruby/backward/2/assume.h
 tcpsocket.o: $(hdrdir)/ruby/backward/2/attributes.h
 tcpsocket.o: $(hdrdir)/ruby/backward/2/bool.h
-tcpsocket.o: $(hdrdir)/ruby/backward/2/extern.h
 tcpsocket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 tcpsocket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 tcpsocket.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2379,7 +2367,6 @@ udpsocket.o: $(hdrdir)/ruby/backward.h
 udpsocket.o: $(hdrdir)/ruby/backward/2/assume.h
 udpsocket.o: $(hdrdir)/ruby/backward/2/attributes.h
 udpsocket.o: $(hdrdir)/ruby/backward/2/bool.h
-udpsocket.o: $(hdrdir)/ruby/backward/2/extern.h
 udpsocket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 udpsocket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 udpsocket.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2564,7 +2551,6 @@ unixserver.o: $(hdrdir)/ruby/backward.h
 unixserver.o: $(hdrdir)/ruby/backward/2/assume.h
 unixserver.o: $(hdrdir)/ruby/backward/2/attributes.h
 unixserver.o: $(hdrdir)/ruby/backward/2/bool.h
-unixserver.o: $(hdrdir)/ruby/backward/2/extern.h
 unixserver.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 unixserver.o: $(hdrdir)/ruby/backward/2/inttypes.h
 unixserver.o: $(hdrdir)/ruby/backward/2/limits.h
@@ -2749,7 +2735,6 @@ unixsocket.o: $(hdrdir)/ruby/backward.h
 unixsocket.o: $(hdrdir)/ruby/backward/2/assume.h
 unixsocket.o: $(hdrdir)/ruby/backward/2/attributes.h
 unixsocket.o: $(hdrdir)/ruby/backward/2/bool.h
-unixsocket.o: $(hdrdir)/ruby/backward/2/extern.h
 unixsocket.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 unixsocket.o: $(hdrdir)/ruby/backward/2/inttypes.h
 unixsocket.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/stringio/depend b/ext/stringio/depend
index 03b3263ced..c525c5f7d5 100644
--- a/ext/stringio/depend
+++ b/ext/stringio/depend
@@ -147,7 +147,6 @@ stringio.o: $(hdrdir)/ruby/backward.h
 stringio.o: $(hdrdir)/ruby/backward/2/assume.h
 stringio.o: $(hdrdir)/ruby/backward/2/attributes.h
 stringio.o: $(hdrdir)/ruby/backward/2/bool.h
-stringio.o: $(hdrdir)/ruby/backward/2/extern.h
 stringio.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 stringio.o: $(hdrdir)/ruby/backward/2/inttypes.h
 stringio.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/strscan/depend b/ext/strscan/depend
index 112f62ff3a..c237b4b22e 100644
--- a/ext/strscan/depend
+++ b/ext/strscan/depend
@@ -147,7 +147,6 @@ strscan.o: $(hdrdir)/ruby/backward.h
 strscan.o: $(hdrdir)/ruby/backward/2/assume.h
 strscan.o: $(hdrdir)/ruby/backward/2/attributes.h
 strscan.o: $(hdrdir)/ruby/backward/2/bool.h
-strscan.o: $(hdrdir)/ruby/backward/2/extern.h
 strscan.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 strscan.o: $(hdrdir)/ruby/backward/2/inttypes.h
 strscan.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/syslog/depend b/ext/syslog/depend
index 897ce5766b..33492e8fcc 100644
--- a/ext/syslog/depend
+++ b/ext/syslog/depend
@@ -146,7 +146,6 @@ syslog.o: $(hdrdir)/ruby/backward.h
 syslog.o: $(hdrdir)/ruby/backward/2/assume.h
 syslog.o: $(hdrdir)/ruby/backward/2/attributes.h
 syslog.o: $(hdrdir)/ruby/backward/2/bool.h
-syslog.o: $(hdrdir)/ruby/backward/2/extern.h
 syslog.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 syslog.o: $(hdrdir)/ruby/backward/2/inttypes.h
 syslog.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/ext/zlib/depend b/ext/zlib/depend
index 623b54a885..72085904fa 100644
--- a/ext/zlib/depend
+++ b/ext/zlib/depend
@@ -147,7 +147,6 @@ zlib.o: $(hdrdir)/ruby/backward.h
 zlib.o: $(hdrdir)/ruby/backward/2/assume.h
 zlib.o: $(hdrdir)/ruby/backward/2/attributes.h
 zlib.o: $(hdrdir)/ruby/backward/2/bool.h
-zlib.o: $(hdrdir)/ruby/backward/2/extern.h
 zlib.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
 zlib.o: $(hdrdir)/ruby/backward/2/inttypes.h
 zlib.o: $(hdrdir)/ruby/backward/2/limits.h
diff --git a/include/ruby/defines.h b/include/ruby/defines.h
index 2c84739b39..82e765d3b2 100644
--- a/include/ruby/defines.h
+++ b/include/ruby/defines.h
@@ -73,7 +73,6 @@
 #include "ruby/backward/2/assume.h"
 #include "ruby/backward/2/attributes.h"
 #include "ruby/backward/2/bool.h"
-#include "ruby/backward/2/extern.h"
 #include "ruby/backward/2/gcc_version_since.h"
 #include "ruby/backward/2/long_long.h"
 #include "ruby/backward/2/stdalign.h"
author	卜部昌平 <shyouhei@ruby-lang.org>	2020-07-21 15:35:26 +0900
committer	卜部昌平 <shyouhei@ruby-lang.org>	2020-08-27 14:07:49 +0900
commit	0da2a3f1fc22da47cdce3cbcd8031d609ba8f207 (patch)
tree	4c6169693f1582bf6f8563419aec9e6aea1c7a70
parent	b2e1688e7d44d45e772ac9d5e79f4ad6e70141d5 (diff)