Error: pg_config executable not found

执行 pip install -r requirements.txt 命令报错:

  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-1tz80kl0/psycopg2.egg-info
      writing /tmp/pip-pip-egg-info-1tz80kl0/psycopg2.egg-info/PKG-INFO
      writing dependency_links to /tmp/pip-pip-egg-info-1tz80kl0/psycopg2.egg-info/dependency_links.txt
      writing top-level names to /tmp/pip-pip-egg-info-1tz80kl0/psycopg2.egg-info/top_level.txt
      writing manifest file '/tmp/pip-pip-egg-info-1tz80kl0/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.

ChatGPT查询可知，缺少 pg 开发库。安装:

# debian, ubuntu
sudo apt-get install -y libpq-dev

# centos, redhat
sudo yum install -y postgresql-devel

# mac
brew install postgresql

ERROR: Failed building wheel for python-ldap

  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for python-ldap
Successfully built gevent
Failed to build python-ldap
ERROR: Could not build wheels for python-ldap, which is required to install pyproject.toml-based projects

通常是因为缺少 python-ldap 包安装所需的系统依赖.如 libldap2-dev 和 libsasl2-dev:

# debian, ubuntu
sudo apt-get install -y python3-dev libldap2-dev libsasl2-dev libssl-dev

# centos
sudo yum install -y python3-devel openldap-devel