title: `require': cannot load such file -- mysql(LoadError)
body: <p>when I use mysql in ruby script occurred LoadError.the detail info is below:</p>
  
  <pre><code>/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- mysql (LoadError)
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from data.rb:3:in `&lt;main&gt;'
  </code></pre>
  
  <p>I have installed mysql2 (0.3.17) gem. And I use this <a href="https://github.com/rails/rails-dev-box/blob/master/bootstrap.sh" rel="nofollow">script</a> to build my ruby environment.  </p>