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From: Volker Armin Hemmann <volkerarmin@googlemail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user]  Re: What causes a package to be brought in during a big emerge?
Date: Sat, 26 Sep 2009 15:22:30 +0200
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On Samstag 26 September 2009, Neil Bothwick wrote:
> On Sat, 26 Sep 2009 05:36:45 +0300, Nikos Chantziaras wrote:
> > Furthermore, *after* "emerge -C oldPackageNoLongerNeeded", do:
> >
> >    grep oldPackageNoLongerNeeded /var/lib/portage/world
> >
> > to see if it's still listed in the world file.  If yes, remove all
> > traces of it (you can simply edit this world file with a text editor,
> > it's safe, but of course you might still want to make a backup of it.)
> 
> emerge -C should remove it from the world file. If it does not, something
> is broken that requires more than editing world.
> 
> You can also check this with emaint -c world.
> 

well sometimes an app appears more than once in world  and after an removal 
instances remain - yes, it should not happen.