MarsSeed [1] filed a deletion request for compton-conf-git [2]: Compton development discontinued since 2017. [a]
The graphical configuration tool also stopped being maintained in 2020; repo archived. [b] There is no need to keep this VCS package. [a]: https://github.com/chjj/compton [b]: https://github.com/lxqt/compton-conf [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/compton-conf-git/
