How to make ImportC work on Windows?

[Guillaume Piolat via Digitalmars-d-learn]

I've literally never managed to make it work, anyone did on 
Windows?

Tried running inside the VS prompt, using "cImportPaths" in DUB, 
but no.

The goal is to build: 
https://forum.dlang.org/post/zqzeswcqxxwjkdprs...@forum.dlang.org
It doesn't find 'box3d/box3d.h'