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	Tue, 30 Mar 2021 01:07:04 -0700 (PDT)
Subject:	Re: How to uninstall packages that were installed as dependency but
	are no longer required
To:	cygwin AT cygwin DOT com
References:	<20210330 DOT 145159 DOT 2203755649720422295 DOT yasu AT utahime DOT org>
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Date:	Tue, 30 Mar 2021 10:07:04 +0200
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From:	Marco Atzeri via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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On 30.03.2021 07:51, Yasuhiro Kimura wrote:
> Hello,
> 
> If you repeat the update of installed Cygwin packages for a while,
> it's quite possible that there are some packages that were installed
> as dependency but are no longer required by any others.
> 
> Then is there any way to detect and uninstall such ones?
> 
> I expect such way as `apt autoremove` of Debian or `dnf autoremove` of
> Fedora.
> 
> Best Regards.
> 
> ---
> Yasuhiro Kimura

as currently we are not tracking between choosen packages
and installed by dependency, Cygwin is lacking such capabilities

the most likely candidates for removal are the different version
of the same libraries

$ cygcheck -cd | grep "^lib" | tee lib.txt

in my case I see

libvpx1                                 1.3.0-2
libvpx3                                 1.5.0-1
libvpx4                                 1.6.1-1
libvpx5                                 1.7.0-1

$ cygcheck-dep -q -n libvpx1 libvpx3 libvpx4 libvpx5
  libvpx1: is needed for ( )
  libvpx3: is needed for ( )
  libvpx4: is needed for ( )
  libvpx5: is needed for ( gstreamer1.0-plugins-good libvpx-devel )

Regards
Marco

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