title: Rectify "INCLUDE environment variable is empty" scandir
body: <p>getting the error in scandir installation any suggestions to rectify if</p>
  
  <p><strong>C:\Python27\scandir-1.5\scandir-1.5>python -m setup.py install</strong></p>
  
  <pre><code>running install
  running bdist_egg
  running egg_info
  writing scandir.egg-info\PKG-INFO
  writing top-level names to scandir.egg-info\top_level.txt
  writing dependency_links to scandir.egg-info\dependency_links.txt
  warning: manifest_maker: standard file '-c' not found
  
  reading manifest file 'scandir.egg-info\SOURCES.txt'    
  reading manifest template 'MANIFEST.in'
  writing manifest file 'scandir.egg-info\SOURCES.txt'
  installing library code to build\bdist.win32\egg
  running install_lib
  running build_py
  running build_ext
  building '_scandir' extension
  error: INCLUDE environment variable is empty
  </code></pre>