This is a proposal to use Sphinx (instead of docbook) in order to generate the documentation for Tuleap.
git clone git@github.com:Enalean/tuleap-documentation-en.git
sudo apt-get install python-pip
sudo pip install -q Sphinx
cd /path/to/tuleap-documentation
make html
The documentation is generated in _build/html/
Tuleap and its documentation are licensed under GPLv2 or above.