"Run without docker" fails: mysql_config not found

[jgalazm]

When running pip3 install -r LSST-server/requirements.txt I get a "mysql_config not found" error.

Console output:

Collecting mysqlclient==1.3.12 (from -r LSST-server/requirements.txt (line 19))
  Downloading mysqlclient-1.3.12.tar.gz (89kB)
    100% |████████████████████████████████| 92kB 1.1MB/s 
    Complete output from command python setup.py egg_info:
    /bin/sh: 1: mysql_config: not found
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-ljj5d7vr/mysqlclient/setup.py", line 17, in <module>
        metadata, options = get_config()
      File "/tmp/pip-build-ljj5d7vr/mysqlclient/setup_posix.py", line 44, in get_config
        libs = mysql_config("libs_r")
      File "/tmp/pip-build-ljj5d7vr/mysqlclient/setup_posix.py", line 26, in mysql_config
        raise EnvironmentError("%s not found" % (mysql_config.path,))
    OSError: mysql_config not found
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-ljj5d7vr/mysqlclient/

The solution that worked for me was to install on Ubuntu
sudo apt-get install libmysqlclient-dev
according to this SO post: https://stackoverflow.com/questions/5178292/pip-install-mysql-python-fails-with-environmenterror-mysql-config-not-found

Maybe it is just something weird on my computer, but I prefer to leave it here for the records.