--- OLD/xc/programs/xwininfo/xwininfo.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/xwininfo/xwininfo.c	Thu Jan  1 00:00:00 1970
@@ -43,6 +43,7 @@
 #include <X11/extensions/shape.h>
 #include <X11/Xmu/WinUtil.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 /* Include routines to handle parsing defaults */
 #include "dsimple.h"