Include prctl header for thread renaming to work.
diff --git a/util.c b/util.c
index 77867b7..4d9ee96 100644
--- a/util.c
+++ b/util.c
@@ -8,7 +8,6 @@
* any later version. See COPYING for more details.
*/
-#define _GNU_SOURCE
#include "config.h"
#include <stdio.h>
@@ -23,6 +22,9 @@
#include <unistd.h>
#include <sys/types.h>
#ifndef WIN32
+# ifdef __linux
+# include <sys/prctl.h>
+# endif
# include <sys/socket.h>
# include <netinet/in.h>
# include <netinet/tcp.h>