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Date: Mon, 17 Sep 2007 11:16:33 -0700
From: Maxim Sobolev <sobomax@FreeBSD.org>
Organization: Sippy Software, Inc.
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To: Dmitry Morozovsky <marck@rinet.ru>
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Cc: current@FreeBSD.org
Subject: Re: i386 package building on an amd64 system
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Dmitry Morozovsky wrote:
> Hi there colleagues,
> 
> possibly stupid question: it there a way to fool jail (real, not "tinderbox" 
> one) that it's working under i386 kernel? This would be extremely useful for 
> local package building.
> 
> Quick googling does not reveal anything, or did I miss something obvious?
> 
> Thanks in advance.

Works here like a charm. The only thing is that you need to set 
UNAME_p=i386 UNAME_m=i386 and CPUTYPE=i686 variables in the chroot/jail.

-Maxim