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Date: Sun, 7 Sep 2003 06:36:56 +0400
From: Andrey Chernov <ache@nagual.pp.ru>
To: Warner Losh <imp@FreeBSD.org>
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Subject: Re: cvs commit: src/usr.bin/make cond.c
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On Sat, Sep 06, 2003 at 19:16:10 -0700, Warner Losh wrote:
> imp         2003/09/06 19:16:10 PDT
> 
>   FreeBSD src repository
> 
>   Modified files:
>     usr.bin/make         cond.c 
>   Log:
>   Keep up with minor changes to NetBSD.  Consider a variable empty when
>   not define.

I doubt it is minor change. Not defined variable usage anywhere outside 
.if defined() construction should cause run-time error and not blind empty 
string substitution.