Currently, the Makefile does not support Mac. This includes incompatibilities with -soname, install -D and asciidoctor. Solutions to the first two problems can be found here and here. No idea on the last problem. There are most likely other problems, but this is where I stopped trying to fix it.

A lot of students in CS50 will most likely be using Macs, so I think this is important. I understand the Cloud9 platform is there, but I think this option should be available if the student desires. I'd be happy to work on this!