MarsSeed [1] filed a deletion request for kactivities4 [2]: This orphaned, deprecated package can be deleted. Uploaded in 2017 as a legacy package; never updated. It's for KDE 4. Current KDE is at 5.24.x. This package never worked as a side-by-side legacy compatibility library, because it conflicts with v5.x of kactivities. Also it's not compatible with current KDE environment so it's not useful to keep. Nothing depends on this v4 library in AUR. Safe to delete. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/kactivities4/