3.1 Finding `configure' Input
Every `configure' script must call `AC_INIT' before doing anything
else. The only other required macro is `AC_OUTPUT' ( 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. 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name is obsolete because some `make' programs have a rule that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'.
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