MarsSeed [1] filed a deletion request for opengts [2]: Abandoned package, PKGBUILD last changed in 2021, broken since at least 1.5 years ago (see OOD flag). Upstream's last release was in 2009.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/opengts/
