problem with math.h

[Amos Bouskila]

Dear gcc help desk:
			While trying to compile under gcc on a  linux (both on Red hat and
Suse) machine, all ANSI math functions causes an 'Undeclared identifier'
error. Surpriseingly the same error appeares whit and without  the
#include <math.h> in the header file. The same pice of code compiled
properly under a different operating system. What is wrong?

thanks !