This is the OPLL (YM2413) emulation fork of Prototracker.
Uses emu2413.c by Mitsutaka Okazaki 2001
Simply do make mingw where "mingw" is your platform of choice. Do make to see the supported platforms.
To install SDL/SDL2 on OSX(using brew), type brew install sdl2 sdl sdl_image sdl_mixer sdl_ttf portmidi. If you are getting the fatal error: 'SDL_image.h' file not found error, type apt-get install libsdl2-image-dev. You should then be able to run make linux.
The binary needs the files in the assets/ directory to work properly.