Some header files seem to be missing from the published code: except.h, framebuf.h, gray.h, reducer.h In additon, the code is (as expected) written in K&R C, s

Some header files seem to be missing from the published code: except.h, framebuf.h, gray.h, reducer.h In additon, the code is (as expected) written in K&R C, so it won't compile out of the box on a modern system.