Install mysql2 gem on macOS using MAMP as mySQL server

When installing mysql2 gem on a system using MAMP as mySQL server, you may end up with a compilation error because of incorrect mysql path.

To deal with this problem, instead of gem install mysql2, try to specify mysql configuration directory:

gem install mysql2 -- --with-mysql-config=/Applications/MAMP/Library/bin/mysql_config

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