Svenstaro [1] filed a deletion request for libdecor [2]:
This is now in [extra] as an sdl2 dependency.
[1] https://aur.archlinux.org/account/Svenstaro/ [2] https://aur.archlinux.org/pkgbase/libdecor/
Request #28545 has been accepted by alex19EP [1].
aur-requests@lists.archlinux.org