I was able to get the demo project for chapter 2 of Matt's book code to successfully build. What worked for me was to track down in xcode all of the alerts about the missing 10.5 sdk and I found that you could change the 10.5 sdk over to 10.6. Then I got an error on build saying "Path does not exist", for this I used the referenced link above, http://redwoodapp.posterous.com/macruby-and-xcode-4-build-a-self-contained-ma, and added the demo app target to build before the compile target. I also changed the valid architecture to x84_64 only as mentioned in the article for good measure.
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