$NetBSD: patch-af,v 1.1.2.2 2006/12/09 10:17:48 salo Exp $

--- common.mk.orig	2006-12-06 00:02:32.000000000 +0900
+++ common.mk
@@ -3,7 +3,7 @@ lib: $(LIBRUBY)
 dll: $(LIBRUBY_SO)
 
 RUBYOPT       =
-NULLCMD       =
+NULLCMD       = :
 
 STATIC_RUBY   = static-ruby
 
