FreeCAD via Macports under MacOS 10.13.6

There were all sorts of errors getting FreeCAD to install, but I found a ticket:
https://trac.macports.org/ticket/60039
Sadly, it still took me a bit to sort it out. You need python2.7 and boost.

sudo port select python27

If you do not have python27, install it. (however, it'll probably come with boost)

sudo port install boost @no_single+no_static+python27

At this point, you should be able to build FreeCad

sudo port install freecad