[boost] [git] bootstrap fails

I have followed the instructions on https://svn.boost.org/trac/boost/wiki/TryModBoost#InstallingModularBoost but bootstrap fails on me. The log file says: ./bootstrap.sh: line 218: cd: ./tools/build/v2/engine: No such file or directory The error message is correct and ./tools/build/v2/engine wasn't cloned. What am I doing wrong? Regards, Christian