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Support for Fuerte is still experimental. I would recommend Electric on OS X for the time being.

As for this problem, there used to be a version of libyaml specifically for ROS, a frozen version if you will. This strategy of freezing non-ROS formulae hasn't worked out so well, so the duplicate formulae in the ros-fuerte tap have been removed. This is why you can't find the libyaml in the ros/fuerte tap.

You can simply replace this command with brew install --universal libyaml and you should be able to continue, but I think you will run into more issues shortly after. You can continue down this path with Fuerte, or backup to Electric, up to you.