You also need a fairly recent version of the official Python bindings to the
Subversion libraries. At the moment, the svn plugin only works with
-Subversion 1.5 (trunk). The python-subversion (not python-svn!) package
+Subversion 1.5. The python-subversion (not python-svn!) package
in Ubuntu since Feisty and Debian since Etch also contain the
required changes.