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-rw-r--r--lib/mkmf.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index df8861a71e..c4b5b59c54 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1757,7 +1757,9 @@ def init_mkmf(config = CONFIG)
$ARCH_FLAG = with_config("arch_flag", arg_config("ARCH_FLAG", config["ARCH_FLAG"])).dup
$CPPFLAGS = with_config("cppflags", arg_config("CPPFLAGS", config["CPPFLAGS"])).dup
$LDFLAGS = with_config("ldflags", arg_config("LDFLAGS", config["LDFLAGS"])).dup
- $INCFLAGS = "-I$(arch_hdrdir) -I$(hdrdir) -I$(srcdir)"
+ $INCFLAGS = "-I$(arch_hdrdir)"
+ $INCFLAGS << " -I$(hdrdir)/ruby/backward" unless $extmk
+ $INCFLAGS << " -I$(hdrdir) -I$(srcdir)"
$DLDFLAGS = with_config("dldflags", arg_config("DLDFLAGS", config["DLDFLAGS"])).dup
$LIBEXT = config['LIBEXT'].dup
$OBJEXT = config["OBJEXT"].dup