Robert Hodgin mentioned that he was getting some errors that cleared up when he added the Core Graphics Library to the project. I know some of the books mention doing this, but for some reason, that lib is always in my default projects anyway. I’ve never had to add it. Something to check if you are having problems.
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To clarify: Project > Add to Project… > /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.0.sdk/System/Library/Frameworks/CoreGraphics.framework