title: ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly
body: <p>I get an error when pip builds wheels for the cryptography package.</p>
  
  <p>Error:</p>
  
  <p><a href="https://i.stack.imgur.com/2F20z.png" rel="noreferrer"><img src="https://i.stack.imgur.com/2F20z.png" alt="Error"></a></p>
  
  <pre><code>LINK : fatal error LNK1181: cannot open input file 'libssl.lib'
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\BuildTools\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX86\\x86\\link.exe' failed with exit status 1181
    ----------------------------------------
    ERROR: Failed building wheel for cryptography
    Running setup.py clean for cryptography
  Failed to build cryptography
  ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly
  </code></pre>
  
  <p>I have already installed OpenSSL and set the environment variables as suggested in <a href="https://stackoverflow.com/a/22210069/7199817">this post</a> yet the problem persists. My setup details: </p>
  
  <ul>
  <li>System - Windows 10 </li>
  <li>Python - 3.8  </li>
  <li>Pip - 19.3.1</li>
  </ul>