You can clone with
In the README.md there is a link to AFDKO (http://www.adobe.com/devnet/opentype/afdko.html) which is broken.
This link works fine for me, maybe that was a temporary issue?
It works for me too.
The link in this issue is the same that a Google search for "AFDKO" returns as the first result, and the Google cached version of it from "Oct 1, 2012 04:32:13 GMT" looks identical to what I see when I follow the link here.
It is working for me now too. It had one of those adobe "the page you are looking for cannot be found" messages this morning.