http://github.com/harbour/core SVN was converted at r18918. (18919 patch is lost, I'll commit it manually)
['core' repo name is subject to change]
I will commit there from now on, if you're active dev member or admin and want to join, drop a message. Everybody else simply fork, patch and submit a pull request if you feel you have something to be included in main repo.
Instead of 'svn export', download source zip: http://github.com/harbour/core/archive/master.zip
Instead of 'svn checkout', do this: git clone http://github.com/harbour/core.git
GitHub supports svn "emulation", see it here: http://github.com/blog/626-announcing-svn-support