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3.1 Finding 'configure' Input
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Every 'configure' script must call 'AC_INIT' before doing anything else.
The only other required macro is 'AC_OUTPUT' (Note: Output).

 -- Macro: AC_INIT (UNIQUE-FILE-IN-SOURCE-DIR)
     Process any command-line arguments and find the source code
     directory.  UNIQUE-FILE-IN-SOURCE-DIR is some file that is in the
     package's source directory; 'configure' checks for this file's
     existence to make sure that the directory that it is told contains
     the source code in fact does.  Occasionally people accidentally
     specify the wrong directory with '--srcdir'; this is a safety
     check.  Note: Invoking configure, for more information.

   Packages that do manual configuration or use the 'install' program
might need to tell 'configure' where to find some other shell scripts by
calling 'AC_CONFIG_AUX_DIR', though the default places it looks are
correct for most cases.

 -- Macro: AC_CONFIG_AUX_DIR (DIR)
     Use the 'install-sh', 'config.sub', 'config.guess', and Cygnus
     'configure' scripts that are in directory DIR.  These are auxiliary
     files used in configuration.  DIR can be either absolute or
     relative to 'SRCDIR'.  The default is 'SRCDIR' or 'SRCDIR/..' or
     'SRCDIR/../..', whichever is the first that contains 'install-sh'.
     The other files are not checked for, so that using
     'AC_PROG_INSTALL' does not automatically require distributing the
     other auxiliary files.  It checks for 'install.sh' also, but that
     name is obsolete because some 'make' programs have a rule that
     creates 'install' from it if there is no 'Makefile'.