Damgaldor [1] filed an adoption request for lib32-libid3tag [2]: Gotta fix the error with "Compatibility with CMake < 3.5 has been removed from CMake."
[1] https://aur.archlinux.org/account/Damgaldor/ [2] https://aur.archlinux.org/pkgbase/lib32-libid3tag/
