如何让黄瓜和RMagick在Snow Leopard上玩得很好？

I installed Snow Leopard and things have been going great, after a few re-installs. But now when I go to run cucumber, I get the error below, and I can't find anything conclusive through Google searches. Has anyone run into this, or maybe have some troubleshooting steps to try? I installed Snow Leopard and things have been g