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(autoconf.info)Programming in M4

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Programming in M4
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   Autoconf is written on top of two layers: "M4sugar", which provides
convenient macros for pure M4 programming, and "M4sh", which provides
macros dedicated to shell script generation.

   As of this version of Autoconf, these two layers are still
experimental, and their interface might change in the future.  As a
matter of fact, _anything that is not documented must not be used_.

M4 Quotation

Protecting macros from unwanted expansion

Invoking autom4te

The Autoconf executables backbone

Programming in M4sugar

Convenient pure M4 macros

Programming in M4sh

Common Shell Constructs