configure Input
Every configure script must call AC_INIT before doing
anything else. The only other required macro is AC_OUTPUT
(see section Creating Output Files).
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. See section Running configure Scripts,
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.
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name is obsolete because some make programs have a rule that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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