config key: svn.authorsfile
+--authors-prog=<filename>::
+
+If this option is specified, for each SVN committer name that does not
+exist in the authors file, the given file is executed with the committer
+name as the first argument. The program is expected to return a single
+line of the form "Name <email>", which will be treated as if included in
+the authors file.
+
-q::
--quiet::
Make 'git-svn' less verbose. Specify a second time to make it