go1.9.linux-amd64 代码编译问题

代码在1.6编译没有问题，放到1.9编译报错： /usr/local/go/src/net/http/h2_bundle.go:45:2: cannot find package "golang_org/x/net/http2/hpack" in any of: /usr/local/go/src/golang_org/x/net/http2/hpack (from $GOROOT)