round() & co missing with LibC

Hi,
another project just updated, and now uses round() which makes compilation 
break since we dont have it with LibC;

SYNOPSIS
       #include <math.h>

       double round(double x);
       float roundf(float x);
       long double roundl(long double x);

       Compile with -std=c99; link with -lm.

CONFORMING TO C99.

is it possible to introduce them?

thanks, Gün.