MarsSeed [1] filed a deletion request for qt5-service [2]: Unused library from 2019; development effectively discontinued since 2020 [a], no releases since that year. [b]
[a]: https://github.com/Skycoder42/QtService/commits/master [b]: https://github.com/Skycoder42/QtService/tags [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/qt5-service/
