FabioLolix [1] filed a deletion request for cantata-qt4 [2]: Qt4 has been disabled in the last version https://github.com/CDrummond/cantata/releases/tag/v2.1.0 - "50 Remove Qt4, KDE4, and Ubuntu touch support."
[1] https://aur.archlinux.org/account/FabioLolix/ [2] https://aur.archlinux.org/pkgbase/cantata-qt4/
