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--- a/configure.ac
+++ b/configure.ac
@@ -31,8 +31,8 @@
    CXXFLAGS="-Wall -O0 -g -D_DEBUG -fcommon"
    AC_MSG_RESULT([yes])
 else
-   CFLAGS="-O3 -fcommon"
-   CXXFLAGS="-O3 -fcommon"
+   CFLAGS?="-O3 -fcommon"
+   CXXFLAGS?="-O3 -fcommon"
    AC_MSG_RESULT([no])
 fi