build failed in ubuntu64

[dongsf]

go run cmd/main.go

github.com/FlowerWrong/netstack/tcpip/link/rawfile

../../../gopath/pkg/mod/github.com/!flower!wrong/netstack@v0.0.0-20190429022415-ec918710caaa/tcpip/link/rawfile/rawfile_unsafe.go:124:10: undefined: BlockingPoll
../../../gopath/pkg/mod/github.com/!flower!wrong/netstack@v0.0.0-20190429022415-ec918710caaa/tcpip/link/rawfile/rawfile_unsafe.go:146:10: undefined: BlockingPoll

github.com/FlowerWrong/netstack/tcpip/stack

../../../gopath/pkg/mod/github.com/!flower!wrong/netstack@v0.0.0-20190429022415-ec918710caaa/tcpip/stack/stack.go:349:12: undefined: tcpip.StdClock