Increase the size of the fonts used By XCode 4's GUI

How can I increase the size of XCode 4's GUI fonts (not the editor, everything else)?

On my MBP 17", it's just 开发者_开发知识库impossible to read that XXX for hours!

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Not Xcode specific, but you might try launching Xcode using the resolution independent scaling built into the OS. It's the same thing you find in the Run action of a scheme, as it scale up the entire UI for an application.