1 files changed, 2 insertions, 0 deletions
diff --git a/includes.h b/includes.h
index 3e206c89..07bcd89f 100644
--- a/includes.h
+++ b/includes.h
@@ -18,7 +18,9 @@
 
 #include "config.h"
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE /* activate extra prototypes for glibc */
+#endif
 
 #include <sys/types.h>
 #include <sys/socket.h> /* For CMSG_* */