In most situations, calling AC_OUTPUT is sufficient to produce
`Makefile's in subdirectories. However, configure scripts
that control more than one independent package can use
AC_CONFIG_SUBDIRS to run configure scripts for other
packages in subdirectories.
AC_OUTPUT run configure in each subdirectory
dir in the given whitespace-separated list. If a given dir
is not found, no error is reported, so a configure script can
configure whichever parts of a large source tree are present. If a
given dir contains `configure.in' but no configure,
the Cygnus configure script found by AC_CONFIG_AUXDIR is
used.
The subdirectory configure scripts are given the same
command line options that were given to this configure script,
with minor changes if needed (e.g., to adjust a relative path for the
cache file or source directory). This macro also sets the output
variable subdirs to the list of directories `dir
...'. `Makefile' rules can use this variable to determine
which subdirectories to recurse into. This macro may be called multiple
times.
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