Correct me if I'm missing something, but why exactly are you using 2.0.0-rc2, when there is 2.0.0-p247 available?

I'd suggest doing

    rbenv install 2.0.0-p247

    rbenv global 2.0.0-p247

Also, it's openssl, not open-ssl, (just in case someone couldn't complete the step) i.e.

    brew install openssl