Source : Free On-Line Dictionary of Computing

imake
     
        A tool which generates {Makefile}s from a template, a set of
        {cpp} {macro}s, and a per-directory input file called an
        Imakefile.  This allows machine dependencies (such has
        compiler options, alternate command names, and special make
        rules) to be kept separate from the descriptions of the
        various items to be built.
     
        imake is distributed with, and used extensively by, the {X
        Window System}.
     
        (1995-02-21)