DWT Cloning / Build fails

[Chris via Digitalmars-d-learn]

This doesn't work:

$ git clone --recursive git://github.com/d-widget-toolkit/dwt.git

$ git clone --recursive 
https://github.com/d-widget-toolkit/dwt.git

(cf. https://github.com/d-widget-toolkit/dwt)

If I just download the master or clone without `--recursive`, 
files are missing and I cannot compile it.

Does anyone know what I'm doing wrong?