SalmonMolon [1] filed a deletion request for lib32-mesa-libgl [2]: lib32-mesa already provides this package which causes confusion if you don't know it. The package is also outdated and does not build
[1] https://aur.archlinux.org/account/SalmonMolon/ [2] https://aur.archlinux.org/pkgbase/lib32-mesa-libgl/
