Is there a mac build?

Yes, see http://www.makehumancommunity.org/wiki/Releases:120mac

There is also an old mac build for 1.1.1, available for download via the download page. This should compatible with older releases of OSX.

It is also possible run from source on mac (see instructions in https://github.com/makehumancommunity/makehuman/blob/master/README.md), through using largely the same approach as on Windows.