--- OLD/xc/programs/rgb/rgb.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/rgb/rgb.c	Thu Jan  1 00:00:00 1970
@@ -44,6 +44,7 @@
 
 #undef NULL
 #include <stdio.h>
+#include <stdlib.h>
 #include <X11/Xos.h>
 #include "rgb.h"
 #include "site.h"