Sorry, I couldn't find any connection between the long 51266 and my blender case. This happens with a build on -current, which I build overnight; I use in-tree Xorg. It is generally unmodified with the exception of backing MSI out of drm2 (as discussed elsewhere, so far needed for my NVidia Quadro 570m card). I didn't have problem building any of the packages quoted in 51266.