Failure to install old mysql2 gem

Question

I am using Mac High Sierra. I am using Ruby 2.2.1 with RVM. I need to use mysql2 with this Ruby on Rails app. I do have mysql 5.7 installed. I do have xcode installed along with

Answer 1

This fixed it for me

gem install mysql2 -v '0.3.21' -- --with-cflags=\"-I/usr/local/opt/openssl/include\" --with-ldflags=\"-L/usr/local/opt/openssl/lib\"

after installing openssl

brew install openssl