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-rw-r--r--lib/mkmf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index f02003fb27..3e80cb0240 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1086,6 +1086,7 @@ LIBRUBYARG_STATIC = #$LIBRUBYARG_STATIC
RUBY_EXTCONF_H = #{$extconf_h}
CFLAGS = #{$static ? '' : CONFIG['CCDLFLAGS']} #$CFLAGS #$ARCH_FLAG
INCFLAGS = -I. #$INCFLAGS
+DEFS = #{CONFIG['DEFS']}
CPPFLAGS = #{extconf_h}#{$CPPFLAGS}
CXXFLAGS = $(CFLAGS) #{CONFIG['CXXFLAGS']}
DLDFLAGS = #$LDFLAGS #$DLDFLAGS #$ARCH_FLAG