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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. The
autoscan program can give you a good start in writing
configure.ac (see autoscan Invocation, 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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