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Date: Sun, 02 Sep 2012 08:51:33 +0300
From: Alexander Kapshuk <alexander.kapshuk@gmail.com>
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Subject: Re: Wrong version of sources?
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On 09/02/2012 03:21 AM, Walter Hurry wrote:
> My standard-
> supfile (copied from examples with only the default host changed) says
> 'tag=RELENG_9'.
>    
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/cvs-tags.html
RELENG_9
The line of development for FreeBSD-9.X, also known as FreeBSD 9-STABLE

You're running 9.1-RC1, which doesn't have the RELENG_9_1 tag available 
yet, as this is a release candidate. Thus the trouble when compiling 
VBox from sources.

Have you rebuilt your kernel and the world once you'd pulled in the 
sources for RELENG_9?

Anyway, that's my take on it.

Alexander Kapshuk.