libcpcap问题!!!

jialijun

我编写的程序编译时候出现问题
我已经把libpcap安装好了在usr/local/include和/lib里
/tmp/cc0zMmr9.o(.text+0x82):/home/TcpDump.c:41: undefined reference to `pcap_lookupnet'
/tmp/cc0zMmr9.o(.text+0xa0):/home/TcpDump.c:42: undefined reference to `pcap_open_live'
/tmp/cc0zMmr9.o(.text+0xe1):/home/TcpDump.c:49: undefined reference to `pcap_compile'
/tmp/cc0zMmr9.o(.text+0x10:/home/TcpDump.c:53: undefined reference to `pcap_setfilter'
/tmp/cc0zMmr9.o(.text+0x12e):/home/TcpDump.c:58: undefined reference to `pcap_loop'
collect2: ld returned 1 exit status
这是怎么回事???