Categories acct-group and acct-user

Portage categories and  are explained here.

TL;DR
Some packages pull in and. Simply leave them as-is, and don't mind; they're like "virtual" or "perl-core" packages.

Explanation
They came to existence by GLEP 81 in 2019.

The packages in these categories are not "real"; they are simply provided to control, in a systematic and ordered manner, (Linux) users and groups.

Notice first some packages need user/group accounts. However, it's not so simple as it may first sound. It's because e.g.:


 * Some packages share the same user/group.
 * This means UIDs/GIDs have to be reliably shared, too.
 * Some user/group become obsolete, but how can it be tracked?

To solve such problems, these categories do exist.