Command "python setup.py egg_info" failed with error code 1

Collecting pattern
Using cached https://files.pythonhosted.org/packages/1e/07/b0e61b6c818ed4b6145fe01d1c341223aa6cfbc3928538ad1f2b890924a3/Pattern-3.6.0.tar.gz
Collecting future (from pattern)
Using cached https://files.pythonhosted.org/packages/90/52/e20466b85000a181e1e144fd8305caf2cf475e2f9674e797b222f8105f5f/future-0.17.1.tar.gz
Collecting backports.csv (from pattern)
Using cached https://files.pythonhosted.org/packages/8e/26/a6bd68f13e0f38fbb643d6e497fc3462be83a0b6c4d43425c78bb51a7291/backports.csv-1.0.7-py2.py3-none-any.whl
Collecting mysqlclient (from pattern)
Using cached https://files.pythonhosted.org/packages/f4/f1/3bb6f64ca7a429729413e6556b7ba5976df06019a5245a43d36032f1061e/mysqlclient-1.4.2.post1.tar.gz
ERROR: Complete output from command python setup.py egg_info:
ERROR: /bin/sh: mysql_config: command not found
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-lgocit98/mysqlclient/setup.py", line 16, in
metadata, options = get_config()
File "/tmp/pip-install-lgocit98/mysqlclient/setup_posix.py", line 51, in get_config
libs = mysql_config("libs")
File "/tmp/pip-install-lgocit98/mysqlclient/setup_posix.py", line 29, in mysql_config
raise EnvironmentError("%s not found" % (_mysql_config_path,))
OSError: mysql_config not found
----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-lgocit98/mysqlclient/

Start by reproducing the installation of pattern and inspect the setup.py dependency path for mysqlclient. Check how the install handles the missing mysql_config command and whether the project documents that prerequisite. Done means the reported installation failure is resolved or its required setup is clearly addressed.