Alad [1] filed a deletion request for x-arc-white [2]: x-arc-white is the maintainer's personal fork. osx-arc-white, which it duplicates, has a dead upstream. Neither have been updated since 2018. A third package, osx-arc-white-git points to a 404 repo on github. As such I would argue to delete all three.
[1] https://aur.archlinux.org/account/Alad/ [2] https://aur.archlinux.org/pkgbase/x-arc-white/