Installing the webidl2mdnbcd tool...?

I’ve been trying to get the webidl2mdnbcd tool (https://github.com/dontcallmedom/webidl2mdnbcd) installed so I can try it out and have failed repeatedly.

It seems to rely on checking out one git repository on top of another one, then building them both, but no matter what order I do things in, either I can’t check the second one out or, if I check it out elsewhere then manually move the files over, it won’t compile.

Any ideas what I need to do in order to make this work? Does anyone have an exact sequence of steps that works?

Sheppy