Added main header include.

core/sys/arg.c

@@ -60,10 +60,11 @@
  *
  * This file is part of the Contiki desktop OS
  *
- * $Id: arg.c,v 1.1 2006/06/17 22:41:19 adamdunkels Exp $
+ * $Id: arg.c,v 1.2 2006/08/14 23:39:23 oliverschmidt Exp $
  *
  */
 
+#include "contiki.h"
 #include "sys/arg.h"
 
 /**