Help-Problem with the math function-

[Matteo]

Hi 
I would like to use some math function but the compiler says always to me ;
undefined reference.. 
Which math functions do you need
so I try to add in the makefile -lm where there are specificated the LIBS like 
following

 LIBS = -lm -lrtemsall -lc

I have try to compile paranoid example too , but I have the same problem with 
all its math function! I would like to use the function pow but I can't!
How I have to do?
Someone can help me ?
I have configured rtems for i386 and pc386.

Thanks in advantage 

Matteo