解决pip报错Error： pg_config executable not found.

报错如下：

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.

原因是系统缺少postgresql-devel这个包。

解决：

yum install postgresql-devel

重新运行pip安装，问题解决。