XD-DENG opened a new pull request #5036: [AIRFLOW-XXX] Pin psycopg2 due to breaking change URL: https://github.com/apache/airflow/pull/5036 psycopg2 releases 2.8 a few hours ago (https://pypi.org/project/psycopg2/#history), and it's causing issue in our CI. Example: https://travis-ci.org/XD-DENG/incubator-airflow/jobs/515704617 ``` Collecting psycopg2>=2.7.4 (from apache-airflow===2.0.0.dev0-) Downloading https://files.pythonhosted.org/packages/c7/ca/75236b17f1b951950ffc55d657c5aa408d3d0327a1b6c4c0f7cb16ef7e7b/psycopg2-2.8.tar.gz (367kB) Complete output from command python setup.py egg_info: running egg_info creating pip-egg-info/psycopg2.egg-info writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt writing pip-egg-info/psycopg2.egg-info/PKG-INFO writing manifest file 'pip-egg-info/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 <http://initd.org/psycopg/docs/install.html>). ```
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