How to install MySQL gem on Mac OS X

Question

What do I need to install mysql gem on Mac OS X ? I'm getting error "failed to build native extensions".

Answer 1

I installed MySQL with Homebrew and I had to use this to finally be able to upgrade the gem:

gem install mysql2 -- --with-mysql-dir=/usr/local/opt/mysql/

Answer 2

I'm using Mac OS X 10.10 (Yosemite), and to me worked with the command bellow:

gem install mysql2 -- \ --with-mysql-config=/usr/local/mysql/bin/mysql_config