$ ruby1.9.1 mikutter.rb <internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- gtk2 (LoadError) from <internal:lib/rubygems/custom_require>:29:in `require' from /opt/miku/mikutter/core/mui/gtk_postbox.rb:7:in `<top (required)>' from <internal:lib/rubygems/custom_require>:29:in `require' from <internal:lib/rubygems/custom_require>:29:in `require' from /opt/miku/mikutter/core/utils.rb:83:in `file_or_directory_require' from /opt/miku/mikutter/core/utils.rb:64:in `miquire' from /opt/miku/mikutter/core/plugin/gui.rb:9:in `<top (required)>' from <internal:lib/rubygems/custom_require>:29:in `require' from <internal:lib/rubygems/custom_require>:29:in `require' from /opt/miku/mikutter/core/utils.rb:83:in `file_or_directory_require' from /opt/miku/mikutter/core/utils.rb:72:in `block in miquire_all_files' from /opt/miku/mikutter/core/utils.rb:71:in `each' from /opt/miku/mikutter/core/utils.rb:71:in `miquire_all_files' from /opt/miku/mikutter/core/utils.rb:66:in `miquire' from /opt/miku/mikutter/core/plugin/plugin.rb:356:in `<top (required)>' from <internal:lib/rubygems/custom_require>:29:in `require' from <internal:lib/rubygems/custom_require>:29:in `require' from /opt/miku/mikutter/core/utils.rb:83:in `file_or_directory_require' from /opt/miku/mikutter/core/utils.rb:64:in `miquire' from /opt/miku/mikutter/core/watch.rb:4:in `<top (required)>' from <internal:lib/rubygems/custom_require>:29:in `require' from <internal:lib/rubygems/custom_require>:29:in `require' from /opt/miku/mikutter/core/utils.rb:83:in `file_or_directory_require' from /opt/miku/mikutter/core/utils.rb:64:in `miquire' from mikutter.rb:61:in `<main>'