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+The C Preprocessor is an interesting standard. It appears to be
+derived from the de-facto behaviour of the first preprocessors, and
+has evolved over the years. Implementation is therefore difficult.
+JCPP is a complete, compliant, standalone, pure Java implementation
+of the C preprocessor. It is intended to be of use to people writing
+C-style compilers in Java using tools like sablecc, antlr, JLex, CUP
+and so forth (although if you aren't using sablecc, you need your
+head examined). This project has has been used to successfully
+preprocess much of the source code of the GNU C library. As of
+version 1.2.5, it can also preprocess the Apple Objective C library.