title: error: Unable to find vcvarsall.bat
body: <p>I tried to install the Python package <a href="https://pypi.python.org/pypi/dulwich" rel="noreferrer">dulwich</a>:</p>
  
  
  
  <pre class="lang-none prettyprint-override"><code>pip install dulwich
  </code></pre>
  
  <p>But I get a cryptic error message:</p>
  
  <pre class="lang-none prettyprint-override"><code>error: Unable to find vcvarsall.bat
  </code></pre>
  
  <p>The same happens if I try installing the package manually:</p>
  
  <pre class="lang-none prettyprint-override"><code>&gt; python setup.py install
  running build_ext
  building 'dulwich._objects' extension
  error: Unable to find vcvarsall.bat
  </code></pre>