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Version Numbers in configure

The following macros manage version numbers for configure scripts. Using them is optional.

Macro: AC_PREREQ (version)
Ensure that a recent enough version of Autoconf is being used. If the version of Autoconf being used to create configure is earlier than version, print an error message on the standard error output and do not create configure. For example:


This macro is useful if your `configure.in' relies on non-obvious behavior that changed between Autoconf releases. If it merely needs recently added macros, then AC_PREREQ is less useful, because the autoconf program already tells the user which macros are not found. The same thing happens if `configure.in' is processed by a version of Autoconf older than when AC_PREREQ was added.

Macro: AC_REVISION (revision-info)
Copy revision stamp revision-info into the configure script, with any dollar signs or double-quotes removed. This macro lets you put a revision stamp from `configure.in' into configure without RCS or CVS changing it when you check in configure. That way, you can determine easily which revision of `configure.in' a particular configure corresponds to.

It is a good idea to call this macro before AC_INIT so that the revision number is near the top of both `configure.in' and configure. To support doing that, the AC_REVISION output begins with `#! /bin/sh', like the normal start of a configure script does.

For example, this line in `configure.in':

AC_REVISION($Revision: 1.30 $)dnl

produces this in configure:

#! /bin/sh
# From configure.in Revision: 1.30

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