MarsSeed [1] filed a deletion request for kupfer-adds-git [2]: This fork/addon has been discontinued in 2015. In 2021, the repo got archived.
Former developer suggests people should use the upstream kupfer (stable package available in Arch repos, VCS one on AUR). This package is also seriously broken (missing lots of deps). Therefore I recommend deletion. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/kupfer-adds-git/
