To build FluidSynth API reference documentation, make sure you have Doxygen
installed.

If you are using the cmake build system, change to the build directory and
execute the following command in this doc/ directory:

$ make doxygen

The latest generated API HTML docs can also be found at:
http://www.fluidsynth.org/api/

Even more documentation references are provided on our wiki page:
https://github.com/FluidSynth/fluidsynth/wiki/Documentation