I'm not super familiar with the details of this stuff -- does this mean that there's basically no hope of any wlroots-based window manager ever working on non-Linux operating systems like BSD?
Most of the BSD variants have some (generally outdated) port of the Linux kernel graphics stack, sometimes even with a wrapper layer to try and make the BSD kernel internals look enough like Linux for it to run unmodified. So it's probably not completely hopeless, but that's mainly because the best shot at getting the graphics accceleration it needs is a straight port of the Linux kernel drivers. (At least for non-NVidia users.)
