title: Adding Devkit to environmental path
body: <p>Despite installing dev tools correctly (at least, following the documentation word for word), I keep getting this error:</p>
  
  <pre><code>C:\devkit&gt;gem install rails
  ERROR:  Error installing rails:
          The 'atomic' native gem requires installed build tools.
  
  Please update your PATH to include build tools or download the DevKit
  from 'http://rubyinstaller.org/downloads' and follow the instructions
  at 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'
  </code></pre>
  
  <p>How can I add the build tools to my Path?</p>
  
  <p>In Windows 7, I know I can edit my path by navigating to </p>
  
  <pre><code>Control Panel » System » Advanced » Environment Variables
  </code></pre>
  
  <p>I've installed Devkit at <code>c:/Devkit</code></p>
  
  <p>But that's all I know. How can I add Devkit to my Environment Variables (at least, I think that's what it means)</p>