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Date: Sat, 12 Dec 2015 22:14:35 -0200
From: =?utf-8?B?THXDrXM=?= Fernando Schultz Xavier da Silveira
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To: Michael Powell <nightrecon@hotmail.com>
Cc: freebsd-questions@freebsd.org
Subject: Re: Cleaning obsolete files after make installworld
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Hello,

> Check out the /usr/src/Makefile, particularly the # check-old and the # 
> delete-old sections. I've never found a need to use these, so I really am 
> uncertain how they would be used. But it seems as if they might come into 
> play after a make buildworld but prior to a make installworld. I could be 
> very wrong about that. But if you can track down how to actually use these 
> targets I think it may remedy the problem.

I did use the delete-old functionality. The problem is the files persist
even after that.

The delete-old command does not seem to take into account software that
was disabled in /etc/src.conf and needs to be removed.