--- process_input.c.orig	Tue Mar 23 21:31:46 2010
+++ process_input.c	Tue Mar 23 21:32:01 2010
@@ -20,6 +20,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 /* process_input.c  by Paul Wilkins 3/21/97 */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>