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前回のpostgreSQLインストールでドタバタしたのも束の間、psycopg2がインストール出来ない！？

postgreSQL 12のインストールは前回を参考にしてください。

# pip3 install psycopg2
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting psycopg2
  Using cached https://files.pythonhosted.org/packages/84/d7/6a93c99b5ba4d4d22daa3928b983cec66df4536ca50b22ce5dcac65e4e71/psycopg2-2.8.4.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 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>).


    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-39d96x6o/psycopg2/

pg_configが使えない？

それでもだめなので、.bashrcにパスを追加

# vi ~/.bashrc
<<<<以下を追加>>>>
export PATH=$PATH:/usr/pgsql-12/bin

それでも、gccが無いと怒られたので

# dnf install gcc
# dnf install postgresql12-devel
# dnf install platform-python-devel.x86_64

　これでもか！ということで

# pip3 install psycopg2

最後良く分からないけど、なんかできた！