I just got my new macbook pro, so after I pulled down Textmate I was ready to start hacking on rails. I fired up the command prompt and did a "sudo gem update" to get up to rails 2.1 so I could use git plugins and other great new features. Well right after I kicked that off I started to get "can't find header files for ruby". To fix this all you need to do is install xcode. Also make sure you do that you do a gem install rails to get activeresource. After this you should be good to go.

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