diff -ru gnuboy-1.0.3.orig/defs.h gnuboy-1.0.3/defs.h
--- gnuboy-1.0.3.orig/defs.h	2001-01-23 07:04:22.000000000 -0500
+++ gnuboy-1.0.3/defs.h	2014-07-04 03:56:46.685149736 -0400
@@ -4,6 +4,10 @@
 #ifndef __DEFS_H__
 #define __DEFS_H__
 
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
 
 
 #ifdef IS_LITTLE_ENDIAN