MarsSeed [1] filed a deletion request for sysupdate [2]: Minimal wrapper script, VCS package in disguise from 2019, upstream not changed since.
Depends on pacaur, which is broken and not developed since 2+ years. I don't think it's useful to keep this package. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/sysupdate/
