--- configure.orig	2012-10-26 13:02:05.000000000 +0900
+++ configure	2012-11-07 01:11:11.000000000 +0900
@@ -17602,8 +17602,8 @@
 
 
 if test -n "$GCC"; then
-   CFLAGS="-O3  -Wno-deprecated -Wall"
-   CXXFLAGS="-O3 -Wno-deprecated -Wall"
+   CFLAGS="$CFLAGS -O3  -Wno-deprecated -Wall"
+   CXXFLAGS="$CXXFLAGS -O3 -Wno-deprecated -Wall"
 fi