MarsSeed [1] filed a deletion request for libao-jack [2]: Orphan package, LibAO source moved to GitLab, experimental Jack patches abandoned 7 years ago and got dropped during GitLab migration. They are not available anymore, only their abandoned feature request ticket: https://gitlab.xiph.org/xiph/libao/-/issues/2083 Seems these patches wouldn't be needed at all. LibAO clients apparently can use Jack via Alsa-Plugins, see: https://mpd.fandom.com/wiki/Configuration#JACK Therefore it's safe to delete this unbuildable package with lost patch sources. No impact, dependents can use and configure Arch/extra/libao. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libao-jack/