Can't install mysql2 gem on macOS Sierra

Question

I\'m setting up my development environment in the new macOS Sierra .

First of all, I installed Rbenv, Ruby (2.3.1)

Answer 1

I am here to share my fix, since the other answers didn't work.

For my environment, I need MySQL 5.6 so I had to use:

brew install mysql56 instead of brew install mysql

Bundle installing the mysql2 gem kept failing, until:

brew link mysql56

I also ran afterwards:

mysql.server start

The last step might be unnecessary, but just in case.