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-rw-r--r--lib/mkmf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index a0cb36fea1..553c547dcd 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -963,7 +963,7 @@ VPATH = #{vpath.join(CONFIG['PATH_SEPARATOR'])}
else
sep = ""
end
- extconf_h = $extconf_h ? "-DRUBY_EXTCONF_H=\\\"$(RUBY_EXTCONF_H)\\\" " : ""
+ extconf_h = $extconf_h ? "-DRUBY_EXTCONF_H=\\\"$(RUBY_EXTCONF_H)\\\" " : $defs.join(" ")<<" "
mk << %{
CC = #{CONFIG['CC']}
LIBRUBY = #{CONFIG['LIBRUBY']}