title: Ruby gem LoadError - rubygems/defaults/operating_system
body: <p>I've installed ruby 1.8.6 p368 and gems 1.3.4 as well as required libraries like zlib, ssl or readline on my winxp sp3 box.
  The problem is, when I now try to use some gem, I get the following error:</p>
  
  <pre><code>Exception `LoadError' at D:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:1112 - no su
  ch file to load -- rubygems/defaults/operating_system
  Exception `LoadError' at D:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.
  rb:31 - no such file to load -- mysql
  </code></pre>
  
  <p>Seems like it makes sense to start with fixing the missing "rubygems/defaults/operating_system" file. How can I do that? TIA</p>
  
  <p>PS:
  gem env is</p>
  
  <pre><code>RubyGems Environment:
    - RUBYGEMS VERSION: 1.3.4
    - RUBY VERSION: 1.8.6 (2009-03-31 patchlevel 368) [i386-mswin32]
    - INSTALLATION DIRECTORY: D:/ruby/lib/ruby/gems/1.8
    - RUBY EXECUTABLE: D:/ruby/bin/ruby.exe
    - EXECUTABLE DIRECTORY: D:/ruby/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - x86-mswin32-60
    - GEM PATHS:
   - D:/ruby/lib/ruby/gems/1.8
   - C:/Documents and Settings/fluffy/.gem/ruby/1.8
    - GEM CONFIGURATION:
       - :update_sources =&gt; true
       - :verbose =&gt; true
       - :benchmark =&gt; false
       - :backtrace =&gt; false
       - :bulk_threshold =&gt; 1000
    - REMOTE SOURCES:
       - http://gems.rubyforge.org/ 
  </code></pre>