Building the documentation has the following prerequisites:
doxygen (www.doxygen.org) sphinx (www.sphinx-doc.org) breathe (https://github.com/michaeljones/breathe)
Doxygen should be installed and found within the PATH environment variable. Sphinx should be installed and found within the PATH environment variable. Breathe is a python module and is expected to be found on the PYTHONPATH environment variable.
To build the documentation into a set of html files:
make html
The documentation index page will be located at:
./build/html/index.html