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