--- a/layout.c	Thu Feb 22 11:45:03 2007 +0100
+++ b/layout.c	Thu Feb 22 12:00:02 2007 +0100
@@ -2,6 +2,7 @@
  * See LICENSE file for license details.
  */
 #include "dwm.h"
+#include <stdlib.h>
 
 unsigned int blw = 0;
 Layout *lt = NULL;