In case anyone was wondering, I was able to get things going using both Xcode 7 and 8.... almost.
First time you run a command, it request a dynlib. Copying it from my system get rids of that problem.
You will also need the full xcode, not just command line tools.
Apparently the unit test framework is required an for that, you need one of the platform packages.
THEN... you hit a wall since actool requires Carbon.framework.
And that's where my adventure ends.
So... in case anyone is wondering... actool will not run under darling for lack of Carbon.framework