背景

在pip install psycopg2-binary 的时候报错了。错误内容如下。

Collecting psycopg2-binary
  Using cached psycopg2-binary-2.8.6.tar.gz (384 kB)
    ERROR: Command errored out with exit status 1:
     command:   'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-bkabu6av/psycopg2-binary/setup.py'"'"'; __file__='"'"'/tmp/pip-install-bkabu6av/psycopg2-binary/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-ez6k71_8s
         cwd: /tmp/pip-install-bkabu6av/psycopg2-binary/
    Complete output (23 lines):
    running egg_info
    creating /tmp/pip-pip-egg-info-ez6k71_8/psycopg2_binary.egg-info
    writing /tmp/pip-pip-egg-info-ez6k71_8/psycopg2_binary.egg-info/PKG-INFO
    writing dependency_links to /tmp/pip-pip-egg-info-ez6k71_8/psycopg2_binary.egg-info/dependency_links.txt
    writing top-level names to /tmp/pip-pip-egg-info-ez6k71_8/psycopg2_binary.egg-info/top_level.txt
    writing manifest file '/tmp/pip-pip-egg-info-ez6k71_8/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>).
    
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

原因分析

从报错的提示来看，是系统不知道pg_config的路径，需要把这个路径添加到PATH当中。但我们并不能找到这个路径在哪。那么我们就前往官网看看

但我的系统里面并不能找到这个包。而是另外一个包   postgresql-devel

解决办法

yum install postgresql-devel