From owner-freebsd-stable@FreeBSD.ORG  Tue Apr 12 12:45:13 2005
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Date: Tue, 12 Apr 2005 22:45:11 +1000
From: Robert Backhaus <robbak@gmail.com>
To: Jan Sebosik <sebosik@demax.sk>
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cc: freebsd-stable@freebsd.org
Subject: Re: Package managment
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On Apr 12, 2005 6:28 PM, Jan Sebosik <sebosik@demax.sk> wrote:
> Hi
> 
> I`ve got one simple question: if i`ve built packages on my freebsd
> 5.3-RELEASE system, do I need to rebuilt them again for 5.4-RELEASE
> (after downloading && compiling from sources) ?
> 
> Best regards,
> Jan Sebosik
> _______________________________________________
> freebsd-stable@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
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> 
With care, in many situations, you should be able to get away with it.
Problems occur with ports that contain kernel modules (ltmdm,
nvidia-driver). There have also been major changes within ports (new
gtk versions, and a gnome upgrade) which will make partial rebuilding
hazardous.

Most of us would recommend a general rebuild, for safety's sake.