Hi Kera,
Have you installed the Xquartz for macOS package? I think this is required to run rvu. If you have and it still does not work, there may be some incompatibility with our build system and your version of macOS. This may require that you build from sources, which should work at least for the renderers and ximage. (You may have to remove the TIFF library dependencies in src/px to get that folder to build properly.)
Cheers,
-Greg