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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 306f23905b..c650b497df 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -263,7 +263,7 @@ hdrdir = #{$hdrdir}
CC = #{CONFIG["CC"]}
prefix = #{CONFIG["prefix"]}
-CFLAGS = #{CONFIG["CCDLFLAGS"]} -I#{$hdrdir} -I#{CONFIG["includedir"]} #{CFLAGS} #{$CFLAGS} #{$defs.join(" ")}
+CFLAGS = #{CONFIG["CCDLFLAGS"]} -I$(hdrdir) -I#{CONFIG["includedir"]} #{CFLAGS} #{$CFLAGS} #{$defs.join(" ")}
DLDFLAGS = #{$DLDFLAGS} #{$LDFLAGS}
LDSHARED = #{CONFIG["LDSHARED"]}