A bit later than planned, the automake build system has been removed from Git. There's very likely some edge cases and unusual combinations that the Cmake system doesn't handle still, so please report any problems or omissions you encounter, and we'll do our best to fix them up.
If you need to setup a Cmake build environment, Brisa's script has been updated, or there's instructions in Git (README.cmake) and on the wiki. Improvements and feedback on all those documents are also welcome - there's already been some additional improvements today.
The documentation already states it, but, PLEASE build outside the source dir, as recommended - it will simplify your life.