How to use trigonometric functions in Swarm?

[Perrone Alessandro]

Hi
I have to use in my simulation some trigonometric functions.
I imported the right header, but when I call the sin(x) function, an 
error occur!!
I am using Linux on my Imac, with Swarm 2.1.1
Here it is the result with a simple program:

------
address@hidden apps]# gcc alex.c -o alex
/tmp/ccHDfVDm.o: In function `main':
/tmp/ccHDfVDm.o(.text+0x20): undefined reference to `sin'
/tmp/ccHDfVDm.o(.text+0x20): relocation truncated to fit: R_PPC_REL24 sin
collect2: ld returned 1 exit status
address@hidden apps]# more alex.c
#include <stdio.h>
#include <math.h>

int main () {
   float a;
   a=(float) sin((double) 1.0);
   printf("%f\n",a);
return 0;
}
address@hidden apps]# gcc -I/usr/include alex.c -o alex
/tmp/cck3PTSF.o: In function `main':
/tmp/cck3PTSF.o(.text+0x20): undefined reference to `sin'
/tmp/cck3PTSF.o(.text+0x20): relocation truncated to fit: R_PPC_REL24 sin
collect2: ld returned 1 exit status
address@hidden apps]#

-----
Any ideas?
Thank a lot for everything.
                                        ALEX

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