Question: Configuration Header Templates

[Jeffrey Walton]

Hi All,

If this is a duplicate question (which I suspect it is), please
forgive me. Search is returning so many irrelevant entries that I
can't find the answer. I also looked in the manual (particularly
Configuration Header Templates), but I did not grasp what I need to
do.

In configure.ac, I have the following:
dnl bignums
AC_ARG_ENABLE([bignum-forcing], AS_HELP_STRING([--enable-bignum-forcing],
  [Force the usage of the 64 bits bignum ...]),
  [force_bignums=$enableval], [force_bignums=no])
if test "x$force_bignums" = "xyes"; then
   AC_DEFINE([PDF_FORCE_BIGNUMS],[0],[Force the usage of the 64 bits
bignum ...])
fi

After bootstrap/configure, this produces (in config.h):
/* Force the usage of the 64 bits bignum ... */
/* #undef PDF_FORCE_BIGNUMS */

Changing to 'AC_DEFINE([PDF_FORCE_BIGNUMS],[1],...' results in:
After configure, this produces:
/* Force the usage of the 64 bits bignum ... */
#undef PDF_FORCE_BIGNUMS

What I'm looking for (notice the a #define is used, and the define is
commented):
/* Force the usage of the 64 bits bignum ... */
/* #define PDF_FORCE_BIGNUMS */

Any ideas on what knob I should turn?

Thanks,
Jeff