title: PyCrypto install error on Windows
body: <p>I am trying to install <a href="http://pypi.python.org/pypi/pycrypto/2.6" rel="noreferrer">PyCrypto 2.6</a> Library on my computer. But I keep getting the following error</p>
  
  <pre><code>D:\Software\Python\package\pycrypto-2.6&gt;python setup.py build
  running build
  running build_py
  running build_ext
  warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath.
  
  building 'Crypto.Random.OSRNG.winrandom' extension
  error: Unable to find vcvarsall.bat
  </code></pre>
  
  <p>My System has 
  Windows 8 Pro 64-bit, Visual Studio Enterprise 2012 and Python 3.3</p>
  
  <p>To fix the error I tried to set the Environment Variable <code>VS90COMNTOOLS=%VS110COMNTOOLS%</code> as advised by <a href="https://stackoverflow.com/a/10558328/777593">fmuecke in the post error: Unable to find vcvarsall.bat</a> but it didn't work for me.</p>
  
  <p>Can any one please advise me how to fix this error.</p>
  
  <p>FYI, I don't to install VC2008 etc..</p>