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-rw-r--r--sysdep/unix/main.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdep/unix/main.c b/sysdep/unix/main.c
index 35bc3fd1..8aa19fce 100644
--- a/sysdep/unix/main.c
+++ b/sysdep/unix/main.c
@@ -8,7 +8,9 @@
#undef LOCAL_DEBUG
-#define _GNU_SOURCE 1
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
#include <stdio.h>
#include <stdlib.h>