--- OLD/xc/programs/xdpyinfo/xdpyinfo.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/xdpyinfo/xdpyinfo.c	Thu Jan  1 00:00:00 1970
@@ -38,6 +38,7 @@
 #endif
 #include <X11/Xos.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 char *ProgramName;
 Bool queryExtensions = False;