> The problem was that Lars was AC_DEFINE($var), which unfortunately
> is not extensible in 2.13.  It is now, and autoheader, IMHO, achieves
> that end for both the maintainer, *and* the end user.  I personally
> consider it is a requirement that all the #undef templates be
> documented/described.

 Does something like

 for ac_func in LIST
 do
 ...
 ac_tr_func=HAVE_`echo $ac_func | tr '[a-z]' '[A-Z]'`
 AC_DEFINE_UNQUOTED($ac_tr_func, 1, [ /* Define if you have $ac_func.  */])
 ...
 done

 work now, too?

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