CB Install Error

Home-Computer:~/Desktop/CB/critiquebrainz-master/docs$ pip3 install -r requirements.txt
Collecting git+https://github.com/metabrainz/brainzutils-python.git@v1.1.0 (from -r ../requirements.txt (line 1))
  Cloning https://github.com/metabrainz/brainzutils-python.git (to v1.1.0) to /tmp/pip-e9occk3u-build
Collecting Sphinx==1.5.1 (from -r requirements.txt (line 1))
  Using cached Sphinx-1.5.1-py2.py3-none-any.whl
Collecting Pygments==2.1.3 (from -r requirements.txt (line 2))
  Using cached Pygments-2.1.3-py2.py3-none-any.whl
Collecting sphinxcontrib-httpdomain==1.5.0 (from -r requirements.txt (line 3))
  Using cached sphinxcontrib_httpdomain-1.5.0-py2.py3-none-any.whl
Collecting beautifulsoup4==4.4.1 (from -r ../requirements.txt (line 2))
  Using cached beautifulsoup4-4.4.1-py3-none-any.whl
Collecting coverage==4.1 (from -r ../requirements.txt (line 3))
  Using cached coverage-4.1.tar.gz
Collecting click==6.6 (from -r ../requirements.txt (line 4))
  Using cached click-6.6-py2.py3-none-any.whl
Collecting Flask-Babel==0.11.1 (from -r ../requirements.txt (line 5))
  Using cached Flask-Babel-0.11.1.tar.gz
Collecting Flask-Login==0.3.2 (from -r ../requirements.txt (line 6))
  Using cached Flask-Login-0.3.2.tar.gz
Collecting Flask-SQLAlchemy==2.1 (from -r ../requirements.txt (line 7))
  Using cached Flask-SQLAlchemy-2.1.tar.gz
Collecting Flask-Testing==0.6.1 (from -r ../requirements.txt (line 8))
  Using cached Flask-Testing-0.6.1.tar.gz
Collecting Flask-WTF==0.12 (from -r ../requirements.txt (line 9))
  Using cached Flask-WTF-0.12.tar.gz
Collecting Markdown==2.6.6 (from -r ../requirements.txt (line 10))
  Using cached Markdown-2.6.6.zip
Collecting musicbrainzngs==0.6 (from -r ../requirements.txt (line 11))
  Using cached musicbrainzngs-0.6.tar.gz
Collecting pytest==3.0.4 (from -r ../requirements.txt (line 12))
  Using cached pytest-3.0.4-py2.py3-none-any.whl
Collecting pytest-cov==2.4.0 (from -r ../requirements.txt (line 13))
  Using cached pytest_cov-2.4.0-py2.py3-none-any.whl
Collecting psycopg2==2.6.1 (from -r ../requirements.txt (line 14))
  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 top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
    writing pip-egg-info/psycopg2.egg-info/PKG-INFO
    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 /tmp/pip-build-2eyrzubh/psycopg2/