Simple ALSA Prgramming problem

Hai all.....

    I am new to Linux Programming.......
I am trying to write a simple 'c'  program using ALSA(Advanced Linux Sound Architecture  v1.0.4rc1) Library API......
(ALSA Drivers are installed and works successfully).....And If I try to compile the following pogram i get the following error message........

error message:
-------------------

/tmp/ccY7c0Dq.o(.text+0x46): In function `main':
: undefined reference to `snd_pcm_open'
collect2: ld returned 1 exit status



Actual code:
-----------------

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sched.h>
#include <errno.h>
#include <getopt.h>
#include <alsa/asoundlib.h>
#include <sys/time.h>

char *device = "plughw:0,0";                    /* playback device */
snd_pcm_format_t format = SND_PCM_FORMAT_S16;   /* sample format */
unsigned int rate = 44100;                      /* stream rate */
unsigned int channels = 1;                      /* count of channels */
unsigned int buffer_time = 500000;              /* ring buffer length in us */
unsigned int period_time = 100000;              /* period time in us */
double freq = 440;                              /* sinusoidal wave frequency in Hz */
int verbose = 0;                                /* verbose flag */
                                                                                                     
snd_pcm_sframes_t buffer_size;
snd_pcm_sframes_t period_size;
snd_output_t *output = NULL;
int main(int argc, char *argv[])
{
struct option long_option[] =
        {
                {"help", 0, NULL, 'h'},
                {"device", 1, NULL, 'D'},
                {"rate", 1, NULL, 'r'},
                {"channels", 1, NULL, 'c'},
                {"frequency", 1, NULL, 'f'},
                {"buffer", 1, NULL, 'b'},
                {"period", 1, NULL, 'p'},
                {"method", 1, NULL, 'm'},
                {"verbose", 1, NULL, 'v'},
                {NULL, 0, NULL, 0},
       };
        snd_pcm_t *handle;
        int err, morehelp;
        snd_pcm_hw_params_t *hwparams;
        snd_pcm_sw_params_t *swparams;
        int method = 0;
        signed short *samples;
        unsigned int chn;
        snd_pcm_channel_area_t *areas;
                                                                                                       
if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
{
                printf("Playback open error: %s\n",0 );
                return 0;
}
                                                                                                       
}