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

First, you should try 2 answer in here If you installed openssl but it still don't work. You should try to o refresh gems reference. A got the same issue and it worked for me.

gem source -r https://rubygems.org/

gem source -a https://rubygems.org/