For some reason glxinfo reports mesa 19.0.0 (stock package on Arch) after I've installed mesa system-wide (18.3.0). I didn't use a PKGBUILD and installed mesa by doing a `sudo make install'. Maybe that's why the bisect went bad? I know using a PKGBUILD is the right way to do it, but the last time I tried to use it I got some conflicts with libglvnd when I tried to replace the Arch Linux mesa package with the custom one.