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Date: Fri, 18 Jan 2013 10:31:29 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Polytropon <freebsd@edvax.de>
Subject: Re: Dependencies after port tree update
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 (wonkity.com [127.0.0.1]); Fri, 18 Jan 2013 10:31:29 -0700 (MST)
Cc: Ralf Mardorf <ralf.mardorf@alice-dsl.net>,
 FreeBSD quest <freebsd-questions@freebsd.org>
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On Fri, 18 Jan 2013, Polytropon wrote:

> On Fri, 18 Jan 2013 16:37:43 +0100, Ralf Mardorf wrote:
>> Do the following directories have to be "more" empty?
...
> If you have copied everything you might need from /usr/local
> (e. g. config files in /usr/local/etc) you can remove the
> whole directory subtree and recreate it using mtree (from
> the /etc/mtree/BSD.local.dist description).

Yes, but it is not required.  I've never done it.