wat.txt

  $ ~/venv2.Darwin/bin/pip install psycopg2
  Collecting psycopg2
    Using cached psycopg2-2.6.2.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 /private/var/folders/lx/73tft7t14fd9kl0w33qmrjzh0000gn/T/pip-build-L0ghD1/psycopg2/
  $ brew install postgresql
  Password:
...
  ==> Installing dependencies for postgresql: openssl, readline
  ==> Installing postgresql dependency: openssl
  ==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2j.el_capitan.bottle.tar.gz
  ######################################################################## 100.0%
  ==> Pouring openssl-1.0.2j.el_capitan.bottle.tar.gz
  ==> Using the sandbox
  ==> Caveats
  A CA file has been bootstrapped using certificates from the system
  keychain. To add additional certificates, place .pem files in
    /usr/local/etc/openssl/certs

  and run
    /usr/local/opt/openssl/bin/c_rehash

  This formula is keg-only, which means it was not symlinked into /usr/local.

  Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries

  Generally there are no consequences of this for you. If you build your
  own software and it requires this formula, you'll need to add to your
  build variables:

      LDFLAGS:  -L/usr/local/opt/openssl/lib
      CPPFLAGS: -I/usr/local/opt/openssl/include

  ==> Summary
  x  /usr/local/Cellar/openssl/1.0.2j: 1,695 files, 12M
  ==> Installing postgresql dependency: readline
  ==> Downloading https://homebrew.bintray.com/bottles/readline-7.0.el_capitan.bottle.tar.gz
  ######################################################################## 100.0%
  ==> Pouring readline-7.0.el_capitan.bottle.tar.gz
  ==> Caveats
  This formula is keg-only, which means it was not symlinked into /usr/local.

  OS X provides the BSD libedit library, which shadows libreadline.
  In order to prevent conflicts when programs look for libreadline we are
  defaulting this GNU Readline installation to keg-only.


  Generally there are no consequences of this for you. If you build your
  own software and it requires this formula, you'll need to add to your
  build variables:

      LDFLAGS:  -L/usr/local/opt/readline/lib
      CPPFLAGS: -I/usr/local/opt/readline/include

  ==> Summary
  x  /usr/local/Cellar/readline/7.0: 45 files, 2M
  ==> Installing postgresql
  ==> Downloading https://homebrew.bintray.com/bottles/postgresql-9.5.4_1.el_capitan.bottle.tar.gz
  ######################################################################## 100.0%
  ==> Pouring postgresql-9.5.4_1.el_capitan.bottle.tar.gz
  ==> Caveats
  If builds of PostgreSQL 9 are failing and you have version 8.x installed,
  you may need to remove the previous version first. See:
    https://github.com/Homebrew/homebrew/issues/2510

  To migrate existing data from a previous major version (pre-9.0) of PostgreSQL, see:
    https://www.postgresql.org/docs/9.5/static/upgrading.html

  To migrate existing data from a previous minor version (9.0-9.4) of PostgreSQL, see:
    https://www.postgresql.org/docs/9.5/static/pgupgrade.html

    You will need your previous PostgreSQL installation from brew to perform `pg_upgrade`.
    Do not run `brew cleanup postgresql` until you have performed the migration.

  To have launchd start postgresql now and restart at login:
    brew services start postgresql
  Or, if you don't want/need a background service you can just run:
    postgres -D /usr/local/var/postgres
  ==> Summary
  x  /usr/local/Cellar/postgresql/9.5.4_1: 3,147 files, 35M
  $ type pg_config
  pg_config is /usr/local/bin/pg_config
  $ ~/venv2.Darwin/bin/pip install psycopg2
  Collecting psycopg2
    Using cached psycopg2-2.6.2.tar.gz
  Installing collected packages: psycopg2
    Running setup.py install for psycopg2 ... done
  Successfully installed psycopg2-2.6.2
  $