MarsSeed [1] filed a deletion request for qalculate-gtk-git [2]: Unbuildable since 3 years ago. I don't think it's useful to keep this package. Repo carries the latest stable version.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/qalculate-gtk-git/
