title: Installing and using godef
body: <p>I install godef:</p>
  
  <pre><code>$ go get -u github.com/rogpeppe/godef
  </code></pre>
  
  <p>Looks great:</p>
  
  <pre><code>$ which godef
  /home/username/go/bin/godef
  </code></pre>
  
  <p>Right where I expect it:</p>
  
  <pre><code>$ echo $GOPATH
  /home/username/go
  </code></pre>
  
  <p>But when called as a command line tool:</p>
  
  <pre><code>$ godef version
  godef: cannot read : open : no such file or directory
  </code></pre>
  
  <p>What's happening?</p>