well the repo uses cmake (which many SC projects do, probly becuse supercollider itself does.) by āthe usualā way, i meant the way you would build and install those ugens on any debian system
sudo apt-get install cmake
cd path-to-repo
mkdir build && cd build
cmake ..
make
sudo make install
[thatās generic, check the actual project / readme of course]
if you dont want to install cmake (disk space) and want to add those ugens to the norns build system then you would make appropriate additions to the wscript i linked. (norns uses waf not cmake.)
oh btw
yes, you can install quarks from the sclang REPL