No Makefile in mac subfolder of repository

From this page of instructions, it suggests that the workflow is to run a make file in the mac subfolder, having either run "git clone..." or having downloaded the code.

Note that the repository version does not include a Makefile and so these instructions don't work. It may be necessary to put the Makefile into the repository subfolder (which currently contains a Makefile.am file, for example). Attempts then to automake this failed since there's no configure.ac file.

The .zip version mentioned in the Downloads link works as expected.