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-rw-r--r--conform/conformtest.pl2
1 files changed, 1 insertions, 1 deletions
diff --git a/conform/conformtest.pl b/conform/conformtest.pl
index a14aa09eeb..25e05a2998 100644
--- a/conform/conformtest.pl
+++ b/conform/conformtest.pl
@@ -37,7 +37,7 @@ $CFLAGS{"ISO99"} = "-std=c99";
 $CFLAGS{"ISO11"} = "-std=c1x -D_ISOC11_SOURCE";
 $CFLAGS{"POSIX"} = "-D_POSIX_C_SOURCE=199912 -ansi";
 $CFLAGS{"XPG3"} = "-D_XOPEN_SOURCE";
-$CFLAGS{"XPG4"} = "-D_XOPEN_SOURCE_EXTENDED";
+$CFLAGS{"XPG4"} = "-D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED";
 $CFLAGS{"UNIX98"} = "-D_XOPEN_SOURCE=500";
 $CFLAGS{"XOPEN2K"} = "-D_XOPEN_SOURCE=600";
 $CFLAGS{"XOPEN2K8"} = "-std=c99 -D_XOPEN_SOURCE=700";