autoconf.info: Obsolete Constructs

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Obsolete Constructs

Autoconf changes, and throughout the years some constructs have been
obsoleted.  Most of the changes involve the macros, but in some cases
the tools themselves, or even some concepts, are now considered
obsolete.
   You may completely skip this chapter if you are new to Autoconf.  Its
intention is mainly to help maintainers updating their packages by
understanding how to move to more modern constructs.