NixOS/nixpkgs — pull request #3290 by MP2E (2014-07-15 19:32:50+00:00)
Title: SDL_mixer : add option to enable FluidSynth for playing MIDIs with SF2s

Fluidsynth is used to enable SDL_mixer to use Soundfonts to play MIDI files, this is invaluable for MIDI programs that use SDL_mixer. Also a small bug with enableNativeMidi was fixed