python - Can't install pg_config for flask app -


i running following command

pip install -r .\requirements.txt

in project directory , following error 

using cached psycopg2-2.5.3.tar.gz complete output 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 pip-egg-info\psycopg2.egg-info\top_level.txt writing dependency_links 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 directory containing pg_config path or specify full executable path option:      python setup.py build_ext --pg-config /path/to/pg_config build ...  or pg_config option in 'setup.cfg'.  ----------------------------------------

command "python setup.py egg_info" failed error code 1 in c:\users\eugene~1\appdata\local\temp\pip-build-mil943\psy copg2

c:\program files\postgresql\9.4\bin has been in environment path


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