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Finding `configure' Input
=========================

   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     name is obsolete because some `make' programs have a rule that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'.