--- a/chgres.c	2001-04-18 22:40:05.000000000 +0200
+++ b/chgres.c	2010-09-17 03:20:37.000000000 +0200
@@ -17,9 +17,11 @@
  */
 
 #include <X11/Xlib.h>
-#include <X11/extensions/xf86dga.h>
+#include <X11/extensions/Xxf86dga.h>
 #include <X11/extensions/xf86vmode.h>
 #include <stdio.h>
+#include <stdlib.h> /* exit() */
+#include <strings.h> /* strcasecmp() */
 
 #define VERSION "0.1"