My understanding is that psycopg2 looks for some postgres files during the 
install.  If you have postgres already installed on the same box, you should be 
able to resolve this problem by adding the postgres folder to your PATH 
environment variable before running 'pip install psycopg2'.  The syntax for 
modifying the PATH might differ a little based on the operating system, but it 
would normally be something like this:

PATH=$PATH:/Library/PostgreSQL/9.1/bin

Here postgres is installed at /Library/PostgreSQL/9.1/bin, but it might be in a 
different location on your machine.  As Fabio mentioned, if you do not have 
postgres installed on the same machine you may be able to add the development 
libraries for your OS and get it to work.

One note about modifying the PATH - due to the way virtualenv can adjust PATH 
contents you may need to add the postgres folder to the PATH after the 
virtualenv is activated.  (not sure about this ...)

Hope that helps!



On Jun 4, 2014, at 6:33 AM, Fabio Caritas Barrionuevo da Luz <bna...@gmail.com> 
wrote:

> 
> If Ubuntu 12.04 or higher
> 
> do:
> 
> sudo apt-get install libpq-dev
> 
> 
> 
> 
> Em quinta-feira, 24 de março de 2011 12h01min43s UTC-3, Andre Lopes escreveu:
> Hi,
> This question is not directly related with Django, but with Python.
> 
> I have installed "virtualenv" to have a virtual environment. Now I
> need to instal "psycopg2" in my virtual environment, but I have not
> successfully installed.
> 
> My steps:
> 
> [quote]
>     pip install
> http://pypi.python.org/packages/source/p/psycopg2/psycopg2-2.4.tar.gz#md5=24f4368e2cfdc1a2b03282ddda814160
> [/quote]
> 
> And I got this message with an error:
> 
> [quote]
>         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
> [/quote]
> 
> My question:
> 
> How can I tell to "pip" where is my pg_config?
> 
> Best Regards,
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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