nylocx [1] filed a orphan request for google-authenticator-libpam-git [2]:
There have been no updates for quiet some time now. And there is a newer working pkgbuild in the comments.
[1] https://aur.archlinux.org/account/nylocx/ [2] https://aur.archlinux.org/pkgbase/google-authenticator-libpam-git/