--- OLD/xc/lib/Xext/XSecurity.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/lib/Xext/XSecurity.c	Thu Jan  1 00:00:00 1970
@@ -20,6 +20,9 @@
 in this Software without prior written authorization from The Open Group.
 
 */
+
+#include <stdio.h>
+
 #include <X11/Xlibint.h>
 #include "Xext.h"
 #include "extutil.h"