This one caught me by surprise. With 10.8 Mountain Lion, installing Xcode doesn’t mean tools like svn will be automatically available via command line. If you want to use svn by terminal for example you’ll have to first open Xcode, next go into Preferences and find the Downloads tab. Then install “Command Line Tools”. After a few minutes you’ll then have all the old tools you know and love available just like before.
Seems SVN is 1.6 what shipped with Mountain Lion:
$ svn --version svn, version 1.6.18 (r1303927) compiled Jun 15 2012, 19:07:58
To bad it’s not 1.7. Lots of nice improvements since 1.6 shipped. Apple tends to be somewhat conservative in what it bundles, so it shouldn’t surprise anyone.