I have been able to enlist my svnroot:
https://w3af.svn.sourceforge.net/svnroot/w3af
But if I try to enlist the trunk directory it fails; this is the trunk directory:
https://w3af.svn.sourceforge.net/svnroot/w3af/trunk
The project is:
http://www.ohloh.net/projects/w3af/
Any ideas?