Autoconf, Automake, and Libtool: autoconf process

| ## C.4 autoconf `autoconf` expands the `m4` macros in ``configure.in'`, perhaps using macro definitions from ``aclocal.m4'`, to generate the `configure` script.
    user input files   optional input   processes          output files
    ================   ==============   =========          ============

                       aclocal.m4 - - - - - -.
                                             V
                                         .--------,
    configure.in ----------------------->|autoconf|------> configure
                                         `--------'

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