In this GIT repository, there are several GIT branches, run git-checkout to get the source files.

$ git branch -a
master  - you are here
staratos-5.x  - StartOS 5.x series pbs resposite
staratos-6.x  - StartOS 6.x series pbs resposite

For instance, when you are using staratos-6.x, you should run
$ git checkout staratos-6.x

To compile and install them, read the README file after "git checkout".

Enjoy!