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From: Martin Vaeth <martin@mvath.de>
Subject: [gentoo-dev] Re: Last rites: user.eclass
Date: Thu, 20 Oct 2022 06:21:03 -0000 (UTC)
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Mike Gilbert <floppym@gentoo.org> wrote:
> On Wed, Oct 19, 2022 at 3:08 PM Martin Vaeth <martin@mvath.de> wrote:
>>
>> Mike Gilbert <floppym@gentoo.org> wrote:
>> > user.eclass [...]
>>
>> It is needed for ebuilds in non-gentoo repositories which cannot
>> reserve a fixed number for users and groups.
>
> If you set ACCT_USER_ID=-1 or ACCT_GROUP_ID=-1, they
> will pick an available UID/GID upon installation.

I was not aware of that.
Indeed, it was probably added after I looked at the documentation last time:
https://github.com/gentoo-mirror/gentoo/commit/
c871b87b56208684b0a1fedeaf24fe10943748e2

Sorry for the noise.