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OK, now I feel like a right noob! Sorry, about the shoddy response. Where would I find these values.
Right click on your project then select:
Properties -> C/C++ -> Preprocessor
or
Properties -> C/C++ -> Command Line
Take a look and check that your settings are all consistent with the values you are using in your source code. It is time well spent to explore all the sections of the Properties dialog and the various options that are available.