linux多线程编成 - Linux/Unix社区 / 程序开发区

#include<stdio.h>
#include<stdlib.h>
#include<pthread.h>

void *first()
{
printf("first pthread-----ABC\n");
}

void *second()
{
printf("second pthread-----ABC\n");
}

int main()
{
printf("mian pthread----ABC\n");
pthread_t fthread;
pthread_t sthread;

pthread_create(&fthread,NULL,first,NULL);
pthread_create(&sthread,NULL,second,NULL);

pthread_join(fthread,NULL);
pthread_join(sthread,NULL);
return 0;
}

我编译提示错误如下
fily@zhaoyf:/media/work/develop/iscsitarget/usr$ gcc -o thread thread.c
/tmp/ccRbUIwW.o: In function `main':
thread.c:(.text+0x4e): undefined reference to `pthread_create'
thread.c:(.text+0x66): undefined reference to `pthread_create'
thread.c:(.text+0x74): undefined reference to `pthread_join'
thread.c:(.text+0x82): undefined reference to `pthread_join'
collect2: ld returned 1 exit status

高手帮忙，我错在哪里了？
我使用的是debian5linux{{