title: Find out source of installed gem
body: <p>This is probably simple, but I'm stumped...</p>
  
  <p>So I've got a gem that needs a fix already installed on a shared development machine.  <strong>How do I tell where it came from, so I can fork it?</strong></p>
  
  <p>Just to eliminate some obvious things, it definitely is installed:</p>
  
  <pre><code>$ be gem list spp_manifests
  
  *** LOCAL GEMS ***
  
  spp_manifests (0.0.4)
  </code></pre>
  
  <p>Checking the gemspec reveals nothing of use (except the author's name, but he's away):</p>
  
  <pre><code>$ gem specification spp_manifests
  
  name: spp_manifests
  homepage: ""
  rubyforge_project: 
  </code></pre>
  
  <p>But it's not public in Github, it's not in our company Github repo, it's not in Rubygems and googling for the name produces lots of links to the Singapore People's Party election manifestos but nothing of use.</p>