When trying to build Emacs trunk on Mac OS 10.6, I get the following link error:

Undefined symbols:
  "_etext", referenced from:
      _memory_warnings in vm-limit.o
  "___morecore", referenced from:
      _check_memory_limits in vm-limit.o
  "___after_morecore_hook", referenced from:
      _memory_warnings in vm-limit.o

The complete make output is attached. Is there anything I can do to
fix this? Where are these symbol definitions supposed to come from?

Thanks
Noah Lavine