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(autoconf.info)Autoconf 2.13

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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