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Index: perftest-4.2/configure.ac
===================================================================
--- perftest-4.2.orig/configure.ac
+++ perftest-4.2/configure.ac
@@ -310,7 +310,7 @@ if [test $HAVE_EXP_OOO_ATTR = yes]; then
 	AC_DEFINE([HAVE_EXP_OOO_ATTR], [1], [Have Experimental Out of order data placement support])
 fi
 
-CFLAGS="-g -Wall -D_GNU_SOURCE -O3 $CFLAGS"
+CFLAGS+=" -g -Wall -D_GNU_SOURCE -O3 $CFLAGS"
 LIBS=$LIBS" -lpthread"
 AC_SUBST([LIBUMAD])
 AC_SUBST([LIBMATH])