ulubis-drm-gbm is a backend for the ulubis window compositor. It allows ulubis to run without X.
ulubis-drm-gbm requires: cffi, osicat, cepl.drm-gbm, cl-libinput.
After installing ulubis with (ql:quickload :ulubis), scripts in the build directory will automatically download ulubis-drm-gbm. Otherwise you can run (ql:quickload :ulubis-drm-gbm) directly.