Seems to work by simply replacing:

ADD_ATTRIB(NSOpenGLPFAAccelerated);

with

ADD_ATTRIB(NSOpenGLPFARendererID);ADD_ATTRIB(kCGLRendererGenericFloatID);

in src/nsgl_context.m.

An automatic (optional?) fallback would be the best option.

Would be useful for debugging OpenGL apps inside a VM. Or as a fallback for incompatible hardware. For that purpose it would then also be great to have a way to check whether hardware acceleration is in use or not.