Toadtoad [1] filed an orphan request for mystiq [2]:

It appears that the maintainer has passed away (https://github.com/swl-x/MystiQ/issues/124). One request made for the package was to remove the "replaces('qwinff') line in the PKGBUILD, which could be done once someone else picks it up.

[1] https://aur.archlinux.org/account/Toadtoad/ [2] https://aur.archlinux.org/pkgbase/mystiq/