Thanks for reporting this, I've changed the svn:externals to point to
where they should - http://svn.silverstripe.com/open/ instead of
svn://svn.silverstripe.com/silverstripe/open/
I've done this for the PHP installer - I assume that was what you were
checking out?
Changeset here:
http://open.silverstripe.com/changeset/52679/phpinstaller/tags/rc/2.2.2-rc3
Cheers,
Matt.