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Date: Mon, 6 Dec 2010 10:34:58 -0800
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From: Nerius Landys <nlandys@gmail.com>
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Cc: jail@freebsd.org, questions <questions@freebsd.org>
Subject: Re: Can I run a 32-bit jail (or software) on a 64-bit server?
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>> I've had success running [at least some] 32 bit software on 64 bit
>> FreeBSD without even using a jail.
>> Do you have /usr/lib32 on your system? =A0This would get installed for
>> example if you rebuild world/kernel following this:
>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html
>> and if you don't inhibit the installation of /usr/lib32 by setting
>> some conf file flag somewhere.
>>
>> There are probably other ways to "get" /usr/lib32 on your system, but
>> I usually rebuild world to make it happen.
>>
>
> Hey man!
>
> Matter of fact - yeah - I do have /usr/lib32. So that's all I need or do =
I
> need to activate something in rc.conf or whatever?
>
> Much obliged!

/usr/lib32 should be all you need [I think].
However you won't be able to correctly compile 32 bit software on your
64 bit system.  For
compiling, you _should_ use a jail, or compile on a 32 bit system.
They're addressing this cross-compiling issue in the latest FreeBSD
sources I think.