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3.1 Writing ‘configure.ac

To produce a configure script for a software package, create a file called ‘configure.ac’ that contains invocations of the Autoconf macros that test the system features your package needs or can use. Autoconf macros already exist to check for many features; see Existing Tests, for their descriptions. For most other features, you can use Autoconf template macros to produce custom checks; see Writing Tests, for information about them. For especially tricky or specialized features, ‘configure.ac’ might need to contain some hand-crafted shell commands; see Portable Shell Programming. The autoscan program can give you a good start in writing ‘configure.ac’ (see section Using autoscan to Create ‘configure.ac, for more information).

Previous versions of Autoconf promoted the name ‘configure.in’, which is somewhat ambiguous (the tool needed to process this file is not described by its extension), and introduces a slight confusion with ‘config.h.in’ and so on (for which ‘.in’ means “to be processed by configure”). Using ‘configure.ac’ is now preferred.


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