Problem compiling simple C program

[John Salmon <salmonjj@comcast.net>]

I'm running Debian Etch on a PC. When I try to compile the following 
(called test.c);

#include <math.h>
#include <stdio.h>

int main()
{
    double
        val = 1.55;

    printf("sine: %g\n", sin(val));

    return 0;
}

using the command line

gcc -Wall -o test test.c

I get

/tmp/cciDV02m.o: In function `main':
test.c:(.text+0x21): undefined reference to `sin'
collect2: ld returned 1 exit status

When I compile the equivalent C++ program using the apropriate C++ 
parameters, everything goes great. Have I neglected to load a Debian 
package? Any help will be appreciated.
-- 
John Salmon
salmonjj@comcast.net
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