Issue #4489 has been updated by James M. Lawrence. I assume you realize that you have broken backwards compatibility by rejecting the second part of the patch. % cat mac.rb # encoding: utf-8-mac puts "foo".encoding % ruby19dev -v mac.rb ruby 1.9.3dev (2011-03-10 trunk 31080) [i386-darwin9.8.0] UTF8-MAC % ./ruby -v mac.rb ruby 1.9.3dev (2011-03-10 trunk 31085) [i386-darwin9.8.0] UTF-8 The full patch keeps compatibility. You may wish to break it, which is fine as long as nobody blames me :) ---------------------------------------- Backport #4489: [PATCH] Encodings with /-(unix|dos|mac)\Z/ http://redmine.ruby-lang.org/issues/4489 Author: James M. Lawrence Status: Assigned Priority: Normal Assignee: Yuki Sonoda Category: Target version: The *-dos and *-mac meta-encodings were not being recognized. utf-8-mac is a special case since it corresponds to a real encoding; its meta-encoding is utf-8-mac-mac. -- http://redmine.ruby-lang.org