--- a/util-src/signal.c	Wed Mar 01 17:48:15 2017 +0100
+++ b/util-src/signal.c	Wed Mar 01 22:27:11 2017 +0100
@@ -26,6 +26,8 @@
  * OTHER DEALINGS IN THE SOFTWARE.
 */
 
+#define _POSIX_C_SOURCE 200809L
+
 #include <signal.h>
 #include <stdlib.h>