--- dclock.c.orig	2008-07-08 05:35:18.000000000 +0200
+++ dclock.c	2010-09-17 00:40:05.000000000 +0200
@@ -7,6 +7,7 @@
  * manager: *Dclock.seconds: on
  */
 #include <stdio.h>
+#include <stdlib.h> /* exit() */
 #include <locale.h>
 #include <X11/Intrinsic.h>
 #include "Dclock.h"