MarsSeed [1] filed a deletion request for cgum-git [2]: Broken package from 2016.
Code is OCAML4 based abandonware, not actively maintained since 2019 and does not support repo's current ocaml v5. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/cgum-git/
