Huh, I think HN killed their git server, I started the clone and it's just sitting there doing nothing after 100K. Eventually dies with:

pdos.csail.mit.edu[0: 128.52.129.126]: errno=Connection timed out

Just FYI for anyone else trying. I looked and this seems to be a mirror that contains the branch they mention:

and you might need this (I did):

sudo apt-get install libc6-dev-i386

but the stock qemu didn't seem to work, their server is kaput, and no mirror on github :(