Free4Good Netbsd uses a custom fork of xorg. There might be some potential to incorporate things, added to Xlibre. But that's probably not going to be possible, for very long; as Xorg and Xlibre diverge in their own ways.
WIth that said, I'm pretty sure Xlibre's github mentions building Xlibre, for NetBSD. And you could, yourself, try getting that into pkgsrc's WIP. But, it would need a maintainer; especially if things needed to be communicated back upstream.
One thing I'd like to work on, but likely requires too much work, is getting something lile xfbdev working on NetBSD. But the Linux/framebuffer and NetBSD/wsdisplay are different beasts. Xlibre committer stefan11111 has been doing work, to bring xfbdev back; potentially with glx(egl/opengles) support. It would also be nice to have something like Directfb, in NetBSD (barely supported long ago). I'm not sure how well the QT and GTK backends are maintained, but it could be interesting; especially if xDirectfb was brought up-to-speed (really out of date).
That is just a daydream, on my part. Dev time, in NetBSD, is often a labor of love. I'm pretty sure it would take a pretty huge shift, in the current opensource echo system, for the NetBSD roadmap to seriously consider supporting something new. That or else a very dedicated team putting the work in, and establishing a strong reason to shift focus towards it.
That is just an observation, on my part. There could be specific goals, that I don't know about. Wayland may be seen as the eventual way forward, here. Some big projects have declared dropping support for X. If that continues, the need to support Wayland will likely take center stage.
There should probably be a fork, of all these projects, led by hobbyists. That is the way it used to be. But the expectations of users would need to change. I remember those times. The current tech trends, would lag behind significantly. Without commercial developing power, hobbyists made things work for their machines and needs. If you couldn't implement it, yourself, you made do. Browser technology, I'm sure, would take a large hit.
Sorry, for the bloated reply.
