Error when trying to install app with mysql2 gem

Question

Im trying to install an open source rails 3.2.21 application that uses the mysql2 gem, but when i try and run the bundle commant I get the followin

Answer 1

I found that I had to use --with-opt-dir=/usr/local/opt.

Specifically, I added the following to my ~/.bundle/config file:

BUNDLE_BUILD__MYSQL2: "--with-opt-dir=/usr/local/opt"