Install the package manager miniconda3, from:
http://conda.pydata.org/miniconda.html
Create a conda environment, for example named 'rioc', containing required packages:
conda create -n rioc python=3 sphinx sphinx_rtd_theme
Activate the conda environment:
source activate rioc
Build the documentation:
cd doc
make html
Open the generated files:
firefox doc/_build/html/index.html