* Makefile.in: Run autogen/copy_autogen if autogen.sh fails,
to create 'configure'; problem reported by Andreas Schwab in <http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00438.html>. * autogen.sh: Exit with status 1 when failing due to missing tools, reverting the 2012-09-10 change to this file. * autogen/copy_autogen: Fail if one of the subsidiary actions fail. Use 'cp -f' for the build-aux files, since the destinations are typically read-only.
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