Ruby 1.8.7 requires explicit requiring of 'thread' in order to use Queue.

nirvdrum · nirvdrum · commit e3a590665be5 · 2014-06-08T11:22:29.000-04:00
diff --git a/lib/svn2git/migration.rb b/lib/svn2git/migration.rb
@@ -1,6 +1,7 @@
 require 'optparse'
 require 'pp'
 require 'timeout'
+require 'thread'
 
 module Svn2Git
   DEFAULT_AUTHORS_FILE = "~/.svn2git/authors"
