Do the screencasts work with ruby 2.0?

[DigitalNative]

I'm currently using ruby version 2.0 and whenever I try to run the following code:

require 'rubygems'

require 'gosu'

class MyGame < Gosu:Window

  def initialize

    super(300, 400, false)

  end

  def update

  end

  def draw

  end

end

window = MyGame.new

window.show

I get this error:

undefined method `Gosu' for main:Object (NoMethodError)

I used RVM to install a newer version of Ruby and from what I've heard gosu is compatible with ruby 2 if on a mac?!?

Please help!