root@ubuntu:~/processNet/processNet# go run testversion.go

github.com/google/gopacket/pcap

/home/go/src/github.com/google/gopacket/pcap/pcap.go:30:22: undefined: pcapErrorNotActivated /home/go/src/github.com/google/gopacket/pcap/pcap.go:52:17: undefined: pcapTPtr /home/go/src/github.com/google/gopacket/pcap/pcap.go:64:10: undefined: pcapPkthdr

`package main

import ( “fmt”

    "github.com/google/gopacket/pcap"

)

func main() { fmt.Println(pcap.Version()) }`

Already installed libpcap and c test available What is the reason？