Preprocessor error messages

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Compile errors can be generated using the preprocessor. This is useful for a number of reasons some of which include, notifying a user if they are on an unsupported platform or an unsupported compiler.

e.g. Return Error if gcc version is 3.0.0 or earlier.

#if __GNUC__ < 3
#error "This code requires gcc > 3.0.0"

e.g. Return Error if compiling on an Apple computer.

#ifdef __APPLE__
#error "Apple products are not supported in this release"

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