title: $GOPATH must not be set to $GOROOT, why not?
body: <p>I've installed Go on my Linux machine in <code>/usr/local/go</code>, and intended to use <code>/usr/local/go/src</code> for development. However when I try this I get the following error:</p>
  
  <pre><code>$GOPATH must not be set to $GOROOT
  </code></pre>
  
  <p>Effectively as I understand it, this means you shouldn't use <code>/usr/local/go</code> for development. Why not?</p>