Debain 安装 revel 遇到问题： golang.org/x/sys/unix

debain 上安装 revel ，

先解决了 websocket 的问题，

却出现了 ： package golang.org/x/sys/unix: unrecognized import path "golang.org/x/sys/unix"

go get -v github.com/revel/revel
Fetching https://golang.org/x/sys/unix?go-get=1
https fetch failed.
import "golang.org/x/sys/unix": https fetch: Get https://golang.org/x/sys/unix?go-get=1: dial tcp 216.58.203.17:443: i/o timeout
package golang.org/x/sys/unix: unrecognized import path "golang.org/x/sys/unix"

uname-a
inux iZ23towazphZ 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux