Quantal package does not include SFTP support

According to the wiki, XBMC has included SFTP support since at latest version 10 (Dharma); however, the Ubuntu-packaged version seems to have left this out. SFTP does not show up as an option when trying "Add Network Location", and when I try to select an Avahi-announced SFTP share I get no response from the UI and the following lines in $XBMC_ROOT/temp/xbmc.log:

17:24:29 T:139986422699776 WARNING: Create - Unsupported protocol(sftp) in sftp://anonymous:password@192.168.1.103:22/
17:24:29 T:139987153262464 ERROR: GetDirectory - Error getting zeroconf://%5fsftp%2dssh%2e%5ftcp%2e%40local%40SFTP%20on%20biggie%2dubu
17:24:29 T:139987153262464 ERROR: CGUIDialogFileBrowser::GetDirectory(zeroconf://%5fsftp%2dssh%2e%5ftcp%2e%40local%40SFTP%20on%20biggie%2dubu) failed

I'm not sure if this is also an issue in earlier Ubuntu releases.