clu [1] filed a deletion request for stiff [2]: Upstream hasn't been touched since 2018, this package hasn't been able to built for a while. I don't have time to submit upstream bugs or help debug, the package is not terribly popular and there are other ways to do what this software does.
[1] https://aur.archlinux.org/account/clu/ [2] https://aur.archlinux.org/pkgbase/stiff/
