Symptoms

git-svn repositories fail to clone/pull/push from Subversion after upgrading to Mac OS X 10.8 Mountain Lion

Cause

Mountain Lion removed the default install of Subversion and the bindings to other languages.

Workaround

On a fresh Mountain Lion install, the simplest way to get git-svn working again is to:

1. Install XCode 4.4
2. Open XCode and in Preferences > Downloads, click 'Install' next to 'Command line tools'
3. In SourceTree, open Preferences > Git and click 'Use System Git', confirming your git path

git-svn should now work again