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Der Wunsch, eine PostgeSQL Datenbankunterstützung für eine Filamentdatenbank bei einer frischen OctoPrint Installation nachzurüsten wurde abgelehnt.  oprint/bin/pip install psycopg2 ergibt:

Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple

Collecting psycopg2

  Using cached psycopg2-2.8.6.tar.gz (383 kB)

    ERROR: Command errored out with exit status 1:

     command: /home/pi/oprint/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-eaezo9u5/psycopg2_570f9f228a2746e5b69eb4577ade54b4/setup.py'"'"'; __file__='"'"'/tmp/pip-install-eaezo9u5/psycopg2_570f9f228a2746e5b69eb4577ade54b4/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 /tmp/pip-pip-egg-info-42q59a0p

         cwd: /tmp/pip-install-eaezo9u5/psycopg2_570f9f228a2746e5b69eb4577ade54b4/

    Complete output (23 lines):

    running egg_info

    creating /tmp/pip-pip-egg-info-42q59a0p/psycopg2.egg-info

    writing /tmp/pip-pip-egg-info-42q59a0p/psycopg2.egg-info/PKG-INFO

    writing dependency_links to /tmp/pip-pip-egg-info-42q59a0p/psycopg2.egg-info/dependency_links.txt

    writing top-level names to /tmp/pip-pip-egg-info-42q59a0p/psycopg2.egg-info/top_level.txt

    writing manifest file '/tmp/pip-pip-egg-info-42q59a0p/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

    <https://www.psycopg.org/docs/install.html>).



    ----------------------------------------

ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Was sich nicht sofort daraus erschließt: Es fehlten ein paar Bibliotheken: sudo apt-get install libpq-dev python-dev. Danach lässt sich die Datenbankunterstützung problemlos nachrüsten.