[ruby-dev:43378] trouble on "requrie 'tk'"

永井＠知能．九工大です．

rev.31169 の変更で，tk が次のようなエラーを生じるようになりました．
===================================================================
$ ./ruby19 -e "p RUBY_REVISION; require 'tk'"
31169
/usr/local/lib/ruby/1.9.1/tk/label.rb:6:in `<top (required)>':
uninitialized constant TkWindow (NameError)
          from
          /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:42:in `require'
          from
          /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:42:in `require'
          from /usr/local/lib/ruby/1.9.1/tk/button.rb:5:in `<top
          (required)>'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:373:in
          `const_get'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:373:in
          `topobj_defined?'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:417:in
          `replace_topobj'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:658:in
          `block in _replace_toplevel_aliases'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:648:in
          `each_key'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:648:in
          `_replace_toplevel_aliases'
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:352:in
          `default_widget_set='
          from /usr/local/lib/ruby/1.9.1/tk/autoload.rb:738:in
          `<top (required)>'
          from
          /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:42:in `require'
          from
          /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:42:in `require'
          from /usr/local/lib/ruby/1.9.1/tk.rb:10:in `<top
          (required)>'
          from
          /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:42:in `require'
          from
          /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:42:in `require'
          from -e:1:in `<main>'
===================================================================
これはどのように対応すべきでしょうか．
仕様変更として対応しなければならないとすると，
非常に大規模な変更が必要になりそうで困っています．
-- 
永井 秀利  ([e-mail])
九州工業大学大学院情報工学研究院知能情報工学研究系知能情報メディア部門助教