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From: Mike Gilbert <floppym@gentoo.org>
Date: Fri, 15 May 2020 23:33:03 -0400
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Subject: Re: [gentoo-user] How can I force emerge to use python 3.6?
To: gentoo-user@lists.gentoo.org
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On Fri, May 15, 2020 at 10:17 PM William Kenworthy <billk@iinet.net.au> wrote:
>
> Hi Victor,
>
>     emerge crashes when it tries to add metadata during the merge stage
> in an emerge installed python module using 3.7 when the PKGDIR is on a
> moosefs share.  When PKGDIR is local its fine.
>
> I am rebuilding some systems now with 3.6 as the PYTHON_SINGLE_TARGET
> but I was hoping for some way to specify emerge use 3.7 or 3.6 without
> having to rebuild portage and all its dependencies everytime I want to
> switch and test ...

Set PYTHON_TARGETS=pytthon3_6. This will ensure portage and its
dependencies are built for python3.6.

You can then set python3.6 as the default interpreter globally by
putting it first in /etc/python-exec/python-exec.conf. There's a
comment with instructions at the top of that file.

If you only want emerge to use python3.6, put it in
/etc/python-exec/emerge.conf instead.