Ruby LoadError：没有要加载的文件--glib2.so

我刚刚安装了gtk2，并按照教程进行了修改，但是得到了

LoadError:没有这样的文件可以加载--glib2。所以当我
需要“gtk2”时，

irb(main):005:0> require 'gtk2'
LoadError: no such file to load -- glib2.so
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from C:/ruby/lib/ruby/gems/1.8/gems/glib2-2.0.0-x86-mingw32/lib/glib2.rb:101
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from C:/ruby/lib/ruby/gems/1.8/gems/gtk2-2.0.0-x86-mingw32/lib/gtk2/base.rb:12
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from C:/ruby/lib/ruby/gems/1.8/gems/gtk2-2.0.0-x86-mingw32/lib/gtk2.rb:11
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:59:in `gem_original_require'
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:59:in `require'
    from (irb):5

ruby 1.8.7（2010-12-23 patchlevel 330）[i386-mingw32]

gtk2（2.0.0 x86-mingw32）

如何修复此错误？
一旦我从下载并安装了
ruby-gnome2-0.16.0-1-i386-mswin32.exe
，它现在正在工作。
您是刚刚安装了gem还是同时安装了库和gem？我安装了
gem gtk2
，但我可以看到
glib2
就在
gtk2
上面。