Kodehawa [1] filed a deletion request for lib32-libgtk3-nocsd-git [2]: https://github.com/ZaWertun/gtk3-nocsd has been unmaintained for a while.
[1] https://aur.archlinux.org/account/Kodehawa/ [2] https://aur.archlinux.org/pkgbase/lib32-libgtk3-nocsd-git/
