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Subject: Re: getting ports updated on an older FreeBSD (5.1)
To: Thomas Mueller <mueller6724@bellsouth.net>, freebsd-questions@freebsd.org
References: <86oak6p8w9.fsf@bsdstb.Belkin>
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From: Mel Pilgrim <list_freebsd@bluerosetech.com>
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Date: Thu, 25 Jun 2015 13:48:57 -0700
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On 2015-06-24 03:10, Thomas Mueller wrote:
> I was thinking about the possibility of building/upgrading the base
> FreeBSD from source by steps, such as 5.1 -> final 6-stable -> final
> 8-stable -> 10.1 or possibly FreeBSD-current.

The introduction of KSE happened in 5.x and IIRC a related ABI break 
starting with 5.4 means the only upgrade path from prior versions is a 
full reinstall because you can't cross-run kernel and userland.