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(autoconf.info)Subdirectories

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Configuring Other Packages in Subdirectories
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   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.

 - Macro: AC_CONFIG_SUBDIRS (DIR ...)
     Make `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.