ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.が発生した[mac]

#エラー 
 (以下全文)


```
ERROR: Command errored out with exit status 1:
     command: /usr/local/opt/python/bin/python3.7 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/6d/j9cscnxs7_v2nxb5jpc_q2_h0000gn/T/pip-install-u_r96wnt/psycopg2/setup.py'"'"'; __file__='"'"'/private/var/folders/6d/j9cscnxs7_v2nxb5jpc_q2_h0000gn/T/pip-install-u_r96wnt/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
         cwd: /private/var/folders/6d/j9cscnxs7_v2nxb5jpc_q2_h0000gn/T/pip-install-u_r96wnt/psycopg2/
    Complete output (23 lines):
    running egg_info
    creating pip-egg-info/psycopg2.egg-info
    writing pip-egg-info/psycopg2.egg-info/PKG-INFO
    writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt
    writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
    writing manifest file 'pip-egg-info/psycopg2.egg-info/SOURCES.txt'
    
    Error: pg_config executable not found.
    
    pg_config is required to build psycopg2 from source.  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'.
    
    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.
    
    For further information please check the 'doc/src/install.rst' file (also at
    <http://initd.org/psycopg/docs/install.html>).
    
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
orange-no-MacBook-Air:spmoveapi uuparupa$ pip install pg_config
Collecting pg_config
  ERROR: Could not find a version that satisfies the requirement pg_config (from versions: none)
ERROR: No matching distribution found for pg_config
orange-no-MacBook-Air:spmoveapi uuparupa$ export PATH=$PATH:/{postgres_home}/bin
orange-no-MacBook-Air:spmoveapi uuparupa$ pip install django-heroku==0.3.1
Collecting django-heroku==0.3.1
  Using cached https://files.pythonhosted.org/packages/59/af/5475a876c5addd5a3494db47d9f7be93cc14d3a7603542b194572791b6c6/django_heroku-0.3.1-py2.py3-none-any.whl
Collecting psycopg2 (from django-heroku==0.3.1)
  Using cached https://files.pythonhosted.org/packages/5c/1c/6997288da181277a0c29bc39a5f9143ff20b8c99f2a7d059cfb55163e165/psycopg2-2.8.3.tar.gz
    ERROR: Command errored out with exit status 1:
     command: /usr/local/opt/python/bin/python3.7 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/6d/j9cscnxs7_v2nxb5jpc_q2_h0000gn/T/pip-install-e9ryjos7/psycopg2/setup.py'"'"'; __file__='"'"'/private/var/folders/6d/j9cscnxs7_v2nxb5jpc_q2_h0000gn/T/pip-install-e9ryjos7/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
         cwd: /private/var/folders/6d/j9cscnxs7_v2nxb5jpc_q2_h0000gn/T/pip-install-e9ryjos7/psycopg2/
    Complete output (23 lines):
    running egg_info
    creating pip-egg-info/psycopg2.egg-info
    writing pip-egg-info/psycopg2.egg-info/PKG-INFO
    writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt
    writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
    writing manifest file 'pip-egg-info/psycopg2.egg-info/SOURCES.txt'
    
    Error: pg_config executable not found.
    
    pg_config is required to build psycopg2 from source.  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'.
    
    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.
    
    For further information please check the 'doc/src/install.rst' file (also at
    <http://initd.org/psycopg/docs/install.html>).
    
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
```
# 原因
拙い英語力なので合ってるかは分かりません。

- pg_configってのがないよ
- pg-configはpycopg2-binaryに含まれてるよ
- python setup.py build_ext --pg-config /path/to/pg_config build ...で生成できるよ

みたいな感じでしょうか。

```
   Error: pg_config executable not found.

    pg_config is required to build psycopg2 from source.  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'.

    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.
```

#解決

```
brew install postgresql
```

よく分からないけど治ったのでﾖｼ!