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Finding `configure' Input
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 - Macro: AC_CONFIG_SRCDIR (UNIQUE-FILE-IN-SOURCE-DIR)
     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:
     configure Invocation, 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 auxiliary build tools (e.g., `install-sh', `config.sub',
     `config.guess', Cygnus `configure', Automake and Libtool scripts
     etc.) 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     name is obsolete because some `make' have a rule that creates
     `install' from it if there is no `Makefile'.