A C preprocessor is a part of a C compiler responsible for macro replacement, conditional compilation and inclusion of header files. It is often found as a stand-alone program on Unix systems.

ucpp is such a preprocessor; it is designed to be quick and light, but anyway fully compliant to the ISO standard 9899:1999, also known as C99. ucpp can be compiled as a stand-alone program, or linked to some other code; in the latter case, ucpp will output tokens, one at a time, on demand, as an integrated lexer.

This package contains the fork (https://github.com/scarabeusiv/ucpp) of the original ucpp (https://github.com/scarabeusiv/ucpp), whose development seems to have stalled.