d_adler [1] filed a deletion request for gnucap-models [2]: May re-gain usefulness once gnucap makes it to point releases but the repo won't be lost, as I understand. In the meantime there's gnucap-models-git to track development.
[1] https://aur.archlinux.org/account/d_adler/ [2] https://aur.archlinux.org/pkgbase/gnucap-models/
