How to increase control stack size

Hello,

 I'm trying to increase hugs stack limit. Up to certain amount, I was
successful with editing prelude.h file, namely modifying constants
NUM_STACK and MAX_EVAL_DEPTH. But it seems that effective maximum
on the MAX_EVAL_DEPTH is 58161 no matter how large the NUM_STACK is.
(Always compiling large model, of course.) How can I increase this
limit up to 32MB? What else should I modify to enable evaluation
of extremely memory consuming programs?

 Thanks for any help,

   Dusan