From owner-freebsd-hackers@FreeBSD.ORG  Sat Oct  8 13:56:23 2005
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Date: Sat, 8 Oct 2005 17:55:54 +0400 (MSD)
From: Maxim Konovalov <maxim@macomnet.ru>
To: Yar Tikhiy <yar@comp.chem.msu.su>
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Cc: hackers@freebsd.org
Subject: Re: SENDMAIL_MC & making world
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On Sat, 8 Oct 2005, 17:47+0400, Yar Tikhiy wrote:

> All,
>
> I'd like to set SENDMAIL_MC in my /etc/make.conf files conditionally
> so that it is not set when I'm making {build,install}world.  I
> upgrade several machines over NFS from a single build server, and
> of course installworld breaks if SENDMAIL_MC differs from what was
> set during buildworld.  At the same time, I'd like to have SENDMAIL_MC
> set for the rest of the time on the machines because `hostname` is
> not a suitable way to construct the .mc names on them due to local
> setup peculiarities.  Any ideas how to achieve this effect?

It is possible to override make.conf location via __MAKE_CONF variable
and use different make.conf at the build,installworld stages.
Perhaps that suits your needs.

-- 
Maxim Konovalov