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-rw-r--r--src/afl-gotcpu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/afl-gotcpu.c b/src/afl-gotcpu.c
index 4163ad65..9db86933 100644
--- a/src/afl-gotcpu.c
+++ b/src/afl-gotcpu.c
@@ -26,7 +26,9 @@
*/
#define AFL_MAIN
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
#include <stdio.h>
#include <stdlib.h>