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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 (see Programming in M4) and M4sh (see Programming in M4sh).
| • 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 |