Alienbuild is a cross-platform build system written in Python with the intent to outperform all other build systems in speed.
A major goal with Alienbuild is to support asset building pipelines and large projects.
After cloning, run 'python2.5 setup.py install'. You can verify the installation worked by doing 'import alienbuild' in a Python interpreter.
Note: Alienbuild is only tested to run on Python 2.5, but may run on older or newer versions. Try at your own risk.