You can clone with
HTTPS or Subversion.
It is said in BENTO_BUILD.txt that waf should be downloaded with svn. That is strange, as the waf project seems to have a git repository, not svn.
DOC: update bento docs (close #2993).
Thanks for the bug report, now fixed. Waf has used been using git for some time now.
A question while you're at it: is it possible to avoid these environment vars (now or in the long run)? It's not very user-friendly. Why can't I do:
pip install waf
pip install Bento
cd <numpy repo>