MarsSeed [1] filed a deletion request for grass6 [2]: Legacy, broken grass v6 package from 2016.
Not compatible with current gdal. AUR has a maintained, working grass v8 package. [a] [a]: https://aur.archlinux.org/packages/grass [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/grass6/
