MarsSeed [1] filed a deletion request for qt5-backgroundprocess [2]: Discontinued, unused, broken third-party Qt 5.9 based library from 2017. Its repo is archived. [a] Its makedepend qpmx (subpackage: qpmx-qpmsource) is missing. (qpmx has as been EOL and broken since 2019, as per developer @Skycoder42's comment. [b] Package got deleted on 1 Jan 2024 via PRQ#52630.) [a]: https://github.com/Skycoder42/QtBackgroundProcess/tags [b]: http://web.archive.org/web/http://aur.archlinux.org/pkgbase/qpmx [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/qt5-backgroundprocess/