Do not use tarballs for releases. They are only a fallback as an absolutely last resort if you for some reason can't use subversion or git. Instead, check out head of one of these: CG-3: - https://github.com/TinoDidriksen/cg3 - https://visl.sdu.dk/svn/visl/tools/vislcg3/trunk CG-3 IDE: - https://github.com/GrammarSoft/cg3ide