MarsSeed [1] filed a deletion request for libpgm-git [2]: This AUR package has been broken for a long time.
Upstream is unmaintained for 2.5+ years. [a] Arch/extra repo carries the last stable release. [b] [a]: https://github.com/steve-o/openpgm [b]: https://archlinux.org/packages/?q=libpgm [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libpgm-git/