title: pyenv proxy not work on MAC
body: <p>As described in the title, the following config, doesn't enable the proxy.</p>
  
  <pre><code>export http_proxy="socks5://127.0.0.1:1080"
  export http_proxys="socks5://127.0.0.1:1080"
  
  pyenv install 3.5.2
  </code></pre>
  
  <p>is there other methods?</p>