(autocf21.info.gz) Subdirectories

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 3.5 Configuring Other Packages in Subdirectories
 ================================================
 
 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.

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