unix下编译socket程序问题，急等

[xiaochun_1999]

各位大侠，socket程序很简单，使用UDP send数据。程序如下
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>

int main()
{
int sock;
struct sockaddr_in addr;

sock = socket(AF_INET, SOCK_DGRAM, 0);

addr.sin_family = AF_INET;
addr.sin_port = htons(12345);
addr.sin_addr.s_addr = inet_addr("192.168.37.21");

sendto(sock, "HELLO", 5, 0, (struct sockaddr *)&addr, sizeof(addr));

close(sock);

return 0;
}



使用gcc -lsocket xxx.c编译后报错：
Undefined first referenced
symbol in file
inet_addr /tmp/ccSbP2MB.o (symbol belongs to implicit dependency /usr/lib/libnsl.so.1)
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

请问怎么回事啊？

[knop1027]

库有问题

[xiaochun_1999]

是说include的库不够还是本身的库有问题？？？

[goodname]

倒过来试试看
gcc xxx.c -lsocket

是solaris系统吗

[goodname]

gcc xxx.c -lsocket -lnsl

[xiaochun_1999]

谢谢楼上大哥了，gcc xxx.c -lsocket -lnsl OK！！！