Updating my /usr/src tree with SVN?

[Chris Maness]

I am trying to update to 9.0, and ran into the surprise that CVS is
not supported for that version.

This site only seems to give a description of updating ports with SVN,
and only hints at checkout/update the src tree.

http://www.freebsd.org/doc/handbook/svn.html#svn-mirrors

Could post the current command to update the source three?  I much
prefer using mergemaster than vi to merge my files.  The binary update
seems to force me to merge files by hand.

Thanks,
Chris