Currently I am fixing the CMake based build system for the minheadless VM for a client. So far I managed to the produce the same kind of results as the normal build system on my local machines for both Linux and Mac. I managed to include the build dependencies for Pharo on the cmake based system. Currently, I am now fixing this VM for Travis CI by using my local account. To avoid this Spam, now I am commenting these lines.
After I get this VM variant building for both, Squeak and Pharo on Travis and on appveyor, I will submit a proper pull request.