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(autoconf.info)Writing Macros

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Writing 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.

Macro Definitions

Basic format of an Autoconf macro.

Macro Names

What to call your new macros.

Quoting

Protecting macros from unwanted expansion.

Dependencies Between Macros

What to do when macros depend on other macros.