--- src/runtime/sys.c	2000-07-19 23:13:44.000000000 +0200
+++ src/runtime/sys.c	2011-12-05 15:01:00.000000000 +0100
@@ -33,8 +33,8 @@
 
 #else
 
-extern int sys_nerr;
-extern char * sys_errlist [];
+// extern int sys_nerr;
+// extern char * sys_errlist [];
 
 char * error_message(void)
 {
