title: Error when installing psycopg2 on Windows 10
body: <pre><code>Collecting psycopg2
    Using cached psycopg2-2.6.1.tar.gz
    Complete output from command python setup.py egg_info:
    running egg_info
    creating pip-egg-info\psycopg2.egg-info
    writing pip-egg-info\psycopg2.egg-info\PKG-INFO
    writing top-level names to pip-egg-info\psycopg2.egg-info\top_level.txt
    writing dependency_links to pip-egg-info\psycopg2.egg-info\dependency_links.txt
    writing manifest file 'pip-egg-info\psycopg2.egg-info\SOURCES.txt'
    warning: manifest_maker: standard file '-c' not found
  
  Error: pg_config executable not found.
  
  Please add the directory containing pg_config to the PATH
  or specify the full executable path with the option:
  
      python setup.py build_ext --pg-config /path/to/pg_config build ...
  
  or with the pg_config option in 'setup.cfg'.
  
  ----------------------------------------
  Command "python setup.py egg_info" failed with error code 1 in 
  C:\Users\peppe\AppData\Local\Temp\pip-build-599lt1cp\psycopg2\
  </code></pre>
  
  <p>Every time I attempt to run <code>pip install psycopg2</code> I get the above error. I tried to download the compiled version, but when I run it, I get an error telling me Python 3.5 must be installed. I have Python 3.5 x86 installed, and I downloaded the x86 version of psycopg2 to match it, so I really cannot find a solution. Anyone have any ideas? I am running Windows 10.</p>