BS86 [1] filed a deletion request for mesa-enable-h264 [2]: the package does only things that the repo version of mesa already does. According to the comments, it is only valid for Manjaro, not for Arch or distributions that use the Arch repositories directly. [1] https://aur.archlinux.org/account/BS86/ [2] https://aur.archlinux.org/pkgbase/mesa-enable-h264/