eschwartz [1] filed a orphan request for cinnamon-screensaver-git [2]:

missing makedepends on gobject-introspection, various missing dependencies, seemingly unmaintained like other cinnamon -git packages

[1] https://aur.archlinux.org/account/eschwartz/ [2] https://aur.archlinux.org/pkgbase/cinnamon-screensaver-git/