--- src/callbacks.c.org	2001-05-15 22:37:04.000000000 +0200
+++ src/callbacks.c	2011-06-15 05:21:32.292819557 +0200
@@ -51,6 +51,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
+#include <stdlib.h> /* exit() */
 
 /****************************************************************************/