Cant compile gl_optix_composite sample

i can’t create the makefiles using ccmake for the gl_optix_composite sample, so i can’t compile it either.
https://github.com/nvpro-samples/gl_optix_composite

Most likely because the shared_optix repository is missing on github.
https://github.com/nvpro-samples/shared_optix

Where can I get it or is there a reason it is gone?