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    <p>You'll receive such error only for packages (or one of package's dependencies) that has <a href="http://docs.python.org/2/extending/extending.html" rel="nofollow">CPython</a> extensions. Pip internally: </p> <ul> <li>downloads the source </li> <li>runs <a href="http://docs.python.org/2/distutils/" rel="nofollow">distutils</a> <code>python setup install</code> </li> <li><code>install</code> prepares setup files and tries to build <a href="http://docs.python.org/2/extending/extending.html" rel="nofollow">CPython</a> extensions in <a href="http://docs.python.org/2/distutils/apiref.html#module-distutils.msvccompiler" rel="nofollow">windows</a> environment</li> <li>windows environment calls MS Visual Studio <code>vcvarsall.bat</code> script which setups DOS environment variables to enable MS Visual Studio's C compiler in the shell</li> <li>if <code>vcvarsall.bat</code> is not found - you'll get this message</li> </ul> <h1>Usual solution</h1> <p>For python libraries which have <a href="http://docs.python.org/2/extending/extending.html" rel="nofollow">CPython</a> extensions that are portable on windows, it is usual to have <strong>windows binary package</strong>, which are downloadable from pypi or library web site. </p> <p>In such cases it is more suitable (and painless) to <strong>install library by downloading and running windows binary package</strong>.</p> <p>There is a feature request for <code>pip</code> to <a href="https://github.com/pypa/pip/issues/520" rel="nofollow">Add support for installation of binary distutils packages on Windows</a>.</p> <h1>New way to do it - wheels</h1> <p>Thanks to comment from @warren-p: <em>That feature request has been superseeded by Wheels support in PIP.</em></p> <p>Official description: <em>A wheel is a ZIP-format archive with a specially formatted filename and the .whl extension.</em></p> <p>As I have understood, if there is windows binary package with extension .whl then start by installing wheel first:</p> <pre><code># Make sure you have the latest pip that supports wheel pip install --upgrade pip pip install wheel </code></pre> <p>and then install .whl like this:</p> <pre><code>pip install full-path-or-url-to-your-library.whl </code></pre> <p>References:</p> <ul> <li><a href="http://pythonwheels.com" rel="nofollow">pythonwheels.com</a></li> <li><a href="https://pypi.python.org/pypi/wheel" rel="nofollow">https://pypi.python.org/pypi/wheel</a></li> <li><a href="http://wheel.readthedocs.org/en/latest/" rel="nofollow">http://wheel.readthedocs.org/en/latest/</a></li> </ul>
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