MarsSeed [1] filed a deletion request for qml-presentation-system [2]: Broken VCS package with wrong name from 2016.
Development of this Qt module seems to have been discontinued since 2017. [a] [a]: https://github.com/qt-labs/qml-presentation-system [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/qml-presentation-system/
