seeing this on Ubuntu 22.04 which has python 3.10

```
pip3 install psycopg2-binary==2.8.5                                                                                                                                                            
Defaulting to user installation because normal site-packages is not writeable                                                                                                                                          
Collecting psycopg2-binary==2.8.5                                                                                                                                                                                      
  Using cached psycopg2-binary-2.8.5.tar.gz (381 kB)                                                                                                                                                                   
  Preparing metadata (setup.py) ... error                                                                                                                                                                              
  error: subprocess-exited-with-error                                                                                                                                                                                  

  × python setup.py egg_info did not run successfully.                                                                                                                                                                 
  │ exit code: 1                                                                                                                                                                                                       
  ╰─> [23 lines of output]                                                                                                                                                                                             
      running egg_info                                                                                                                                                                                                 
      creating /tmp/pip-pip-egg-info-qc0tg_5p/psycopg2_binary.egg-info                                                                                                                                                 
      writing /tmp/pip-pip-egg-info-qc0tg_5p/psycopg2_binary.egg-info/PKG-INFO                                                                                                                                         
      writing dependency_links to /tmp/pip-pip-egg-info-qc0tg_5p/psycopg2_binary.egg-info/dependency_links.txt                                                                                                         
      writing top-level names to /tmp/pip-pip-egg-info-qc0tg_5p/psycopg2_binary.egg-info/top_level.txt                                                                                                                 
      writing manifest file '/tmp/pip-pip-egg-info-qc0tg_5p/psycopg2_binary.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.

```