1) git clone https://github.com/alex-free/psx80mp
2) cd psx80mp
3) make deps (if on Linux, for Windows skip this and just ensure you have gcc installed).
4) make
Other rules:
make all - build all release files for Linux and Windows (requires build on Linux currently).
make clean - delete built objects, excluding zip releases generated by make all.
make clean-zip - delete built objects including zip releases generated by make all.