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10 Writing Autoconf Macros
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When you write a feature test that could be applicable to more than one
software package, the best thing to do is encapsulate it in a new macro.
Here are some instructions and guidelines for writing Autoconf macros.
You should also familiarize yourself with M4sugar (*note Programming in
M4::) and M4sh (*note Programming in M4sh::).

* Menu:

* Macro Definitions::           Basic format of an Autoconf macro
* Macro Names::                 What to call your new macros
* Dependencies Between Macros::  What to do when macros depend on other macros
* Obsoleting Macros::           Warning about old ways of doing things
* Coding Style::                Writing Autoconf macros à la Autoconf