MarsSeed [1] filed a deletion request for faiss-echo-git [2]: PKGBUILD is from 2016 and has no pkgver(). Upstream not developed since that 2018. [a] Package name is bogus and misleading: no relation to Facebook Research's faiss toolkit. [b] [a]: https://github.com/faissaloo/echo [b]: https://aur.archlinux.org/pkgbase/faiss [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/faiss-echo-git/