title: nodeenv : error when trying to start env
body: <p>I've got an error when trying to start a virtual env with nodeenv : </p>
  
  <pre><code>$ nodeenv env
  
   * Install node.js (0.8.16) ..Traceback (most recent call last):
    File "/usr/local/bin/nodeenv", line 9, in &lt;module&gt;
      load_entry_point('nodeenv==0.6.0', 'console_scripts', 'nodeenv')()
    File "/usr/local/lib/python2.7/dist-packages/nodeenv-0.6.0-py2.7.egg/nodeenv.py", line 494, in main
      create_environment(env_dir, opt)
    File "/usr/local/lib/python2.7/dist-packages/nodeenv-0.6.0-py2.7.egg/nodeenv.py", line 410, in create_environment
      install_node(env_dir, src_dir, opt)
    File "/usr/local/lib/python2.7/dist-packages/nodeenv-0.6.0-py2.7.egg/nodeenv.py", line 332, in install_node
      callit(['make'], opt.verbose, True, node_src_dir, env)
    File "/usr/local/lib/python2.7/dist-packages/nodeenv-0.6.0-py2.7.egg/nodeenv.py", line 263, in callit
      % (cmd_desc, proc.returncode))
  OSError: Command make failed with error code 2
  </code></pre>
  
  <p>Didn't find anything on the web about this error, could you give me a little help ?</p>