python setup.py egg_info did not run successfully. error: metadata-generation-failed

[angelperezleon]

When trying:
source ./flask/bin/activate pip install -r requirements.txt

I get:

Collecting psycopg2==2.9.5
  Downloading psycopg2-2.9.5.tar.gz (384 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 384.3/384.3 kB 76.7 MB/s eta 0:00:00
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [25 lines of output]
      /opt/web/powerdns-admin/flask/lib/python3.11/site-packages/setuptools/config/setupcfg.py:515: SetuptoolsDeprecationWarning: The license_file parameter is deprecated, use license_files instead.
        warnings.warn(msg, warning_class)
      running egg_info
      creating /tmp/pip-pip-egg-info-i17qkh0z/psycopg2.egg-info
      writing /tmp/pip-pip-egg-info-i17qkh0z/psycopg2.egg-info/PKG-INFO
      writing dependency_links to /tmp/pip-pip-egg-info-i17qkh0z/psycopg2.egg-info/dependency_links.txt
      writing top-level names to /tmp/pip-pip-egg-info-i17qkh0z/psycopg2.egg-info/top_level.txt
      writing manifest file '/tmp/pip-pip-egg-info-i17qkh0z/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>).

      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.
(flask) root@pi5:/opt/web/powerdns-admin#

[angelperezleon]

I think the above error resolved by doing th efollowing work around
sudo apt install libpq-dev python3-dev
As per discussion found here: http://stackoverflow.com/questions/5420789/ddg#5450183 (Option 2)