title: gvm setting GOPATH in ubuntu 14.04
body: <p>I installed <code>gvm</code> with <code>go1.3</code>, what next? I'm trying to build <code>Revel</code>, but I have the error:</p>
  
  <pre><code>can't load package: package github.com/robfig/revel/cmd: cannot find package "github.com/robfig/revel/cmd" in any of:
      /home/cnaize/.gvm/gos/go1.3/src/pkg/github.com/robfig/revel/cmd (from $GOROOT)
      ($GOPATH not set)
  </code></pre>
  
  <p>How to fix this?</p>