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-rw-r--r--src/afl-ld-lto.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/afl-ld-lto.c b/src/afl-ld-lto.c
index b306c8d5..b1e6c848 100644
--- a/src/afl-ld-lto.c
+++ b/src/afl-ld-lto.c
@@ -23,7 +23,9 @@
 */
 
 #define AFL_MAIN
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+  #define _GNU_SOURCE
+#endif
 
 #include "config.h"
 #include "types.h"