The SLProject is hosted at GitHub as a GIT repository. GIT is a distributed versioning control system.
The SLProject contains some GIT submodules. To clone all at once you need to clone recursively. You can clone recursively either with the GitHub GUI-Tool or with the following command in the console:
git clone --recursive https://github.com/cpvrlab/SLProject.git
cd SLProjectFor detailed build instructions on various platforms go to the SLProject wiki.
See the SLProject Homepage for more information. Or go directly to the html documentation here: framework documentation