Mineo [1] filed a deletion request for postgresql-musicbrainz-collate [2]: This extension is no longer required and maintained, see https://blog.metabrainz.org/2020/05/04/reminder-upgrading-to- postgresql-12-on-may-18-2020/
[1] https://aur.archlinux.org/account/Mineo/ [2] https://aur.archlinux.org/pkgbase/postgresql-musicbrainz-collate/
