( Changed Macros

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 13.3 Changed Macros
 Many of the macros were renamed in Autoconf version 2.  You can still
 use the old names, but the new ones are clearer, and it's easier to find
 the documentation for them.   Old Macro Names, for a table
 showing the new names for the old macros.  Use the `autoupdate' program
 to convert your `' to using the new macro names.  
 Invoking autoupdate.
    Some macros have been superseded by similar ones that do the job
 better, but are not call-compatible.  If you get warnings about calling
 obsolete macros while running `autoconf', you may safely ignore them,
 but your `configure' script will generally work better if you follow
 the advice it prints about what to replace the obsolete macros with.  In
 particular, the mechanism for reporting the results of tests has
 changed.  If you were using `echo' or `AC_VERBOSE' (perhaps via
 `AC_COMPILE_CHECK'), your `configure' script's output will look better
 if you switch to `AC_MSG_CHECKING' and `AC_MSG_RESULT'.   Printing
 Messages.  Those macros work best in conjunction with cache
 variables.   Caching Results.
Info Catalog ( Changed Makefiles ( Upgrading ( Invoking autoupdate
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