* Makefile.in (AUTOCONF, AUTOHEADER, ACLOCAL, ACLOCAL_AMFLAGS):
	New variables.
	($(srcdir)/configure, $(srcdir)/config.h.in, $(srcdir)/aclocal.m4):
	Use them.

gcc/
	* Makefile.in (AUTOCONF, ACLOCAL, ACLOCAL_AMFLAGS, aclocal_deps):
	New variables.
	($(srcdir)/configure, $(srcdir)/aclocal.m4): New rules.
	(AUTOHEADER): New variable.
	($(srcdir)/cstamp-h.in): Use it.

gnattools/
	* Makefile.in (AUTOCONF, configure_deps): New variables.
	($(srcdir)/configure): Use them.

libada/
	* Makefile.in (AUTOCONF, configure_deps): New variables.
	($(srcdir)/configure)): Use them.  Also depend on multi.m4.

libgcc/
	* configure.ac: Add snippet for maintainer-mode.
	* configure: Regenerate.
	* Makefile.in (AUTOCONF, configure_deps): New variables.
	($(srcdir)/configure)): New rule, active only with maintainer
	mode turned on.

libiberty/
	* Makefile.in (AUTOCONF, configure_deps): New variables.
	($(srcdir)/configure): New rule, active only in maintainer mode.

libobjc/
	* Makefile.in (AUTOCONF, ACLOCAL, AC...