I spent the afternoon and evening getting Ruby on Rails setup on a MacBook Pro. It should have been a straightforward install, but I kept getting an error about psych missing when I would run gem to install Rails. The system kept saying that I should install the yaml package and reinstall Ruby.
After much searching and frustration, I ended up using Homebrew to install libyaml. After reinstalling Ruby using RVM, all worked and I’m up and running.

