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Date: Fri, 29 Feb 2008 01:03:31 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Edwin Groothuis <edwin@mavetju.org>, Marko Lerota <mlerota@iskon.hr>, 
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Subject: Re: Upgrading to 7.0 - stupid requirements
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Edwin Groothuis wrote:
> On Fri, Feb 29, 2008 at 12:08:22AM +0100, Marko Lerota wrote:
>> In http://www.freebsd.org/releases/7.0R/announce.html says 
>>
>> Updating Existing Systems
>>
>>> An upgrade of any existing system to FreeBSD 7.0-RELEASE constitutes 
>>> a major version upgrade, so no matter which method you use to update 
>>> an older system you should reinstall any ports you have installed on 
> 
> Should, not must. Use misc/compat6x if you don't want to do this,
> but that doesn't work for things which look in the kernel (sysutils/lsof
> for example)

No: must, not should.

If you don't do this, then when you update e.g. only some of the gnome 
libraries without recompiling all of gnome, then your gnome binaries 
will have libraries linked to libc.so.6 and libc.so.7, and to 
libkse.so.2 as well as libthr.so.3, and this is a guaranteed runtime 
crash because these are mutually inconsistent sets of libraries.

The mailing list archives have many examples of people who ran into this 
in the past.

Kris