title: How to install psycopg2 with "pip" on Python?
body: <p>I'm using <em><code>virtualenv</code></em> and I need to install "psycopg2".</p>
  
  <p>I have done the following:</p>
  
  <pre><code>pip install http://pypi.python.org/packages/source/p/psycopg2/psycopg2-2.4.tar.gz#md5=24f4368e2cfdc1a2b03282ddda814160
  </code></pre>
  
  <p>And I have the following messages:</p>
  
  <pre><code>Downloading/unpacking http://pypi.python.org/packages/source/p/psycopg2/psycopg2
  -2.4.tar.gz#md5=24f4368e2cfdc1a2b03282ddda814160
    Downloading psycopg2-2.4.tar.gz (607Kb): 607Kb downloaded
    Running setup.py egg_info for package from http://pypi.python.org/packages/sou
  rce/p/psycopg2/psycopg2-2.4.tar.gz#md5=24f4368e2cfdc1a2b03282ddda814160
      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'.
      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
  Storing complete log in C:\Documents and Settings\anlopes\Application Data\pip\p
  ip.log
  </code></pre>
  
  <p>My question, I only need to do this to get the psycopg2 working?</p>
  
  <pre><code>python setup.py build_ext --pg-config /path/to/pg_config build ...
  </code></pre>