(autoconf.info)Dependencies Between Macros

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7.4 Dependencies Between Macros
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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.

Obsolete Macros

Warning about old ways of doing things.