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Some Autoconf macros depend on other macros having been called first in order to work correctly. Autoconf provides a way to ensure that certain macros are called if needed and a way to warn the user if macros are called in an order that might cause incorrect operation.
| • Prerequisite Macros | Ensuring required information | |
| • Suggested Ordering | Warning about possible ordering problems | |
| • One-Shot Macros | Ensuring a macro is called only once |