(autoconf.info)Autoconf 2.13


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17.6 Upgrading From Version 2.13
================================

The introduction of the previous section (Note: Autoconf 1) perfectly
suits this section....

     Autoconf version 2.50 is mostly backward compatible with version
     2.13.  However, it introduces better ways to do some things, and
     doesn't support some of the ugly things in version 2.13.  So,
     depending on how sophisticated your `configure.ac' files are, you
     might have to do some manual work in order to upgrade to version
     2.50.  This chapter points out some problems to watch for when
     upgrading.  Also, perhaps your `configure' scripts could benefit
     from some of the new features in version 2.50; the changes are
     summarized in the file `NEWS' in the Autoconf distribution.

* Changed Quotation
Broken code which used to work
* New Macros
Interaction with foreign macros
* Hosts and Cross-Compilation
Bugward compatibility kludges
* AC_LIBOBJ vs LIBOBJS
LIBOBJS is a forbidden token
* AC_FOO_IFELSE vs AC_TRY_FOO
A more generic scheme for testing sources

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