golang.org/x包无法下载

git clone https://github.com/golang/net.git %GOPATH%/src/github.com/golang/net 


git clone https://github.com/golang/sys.git %GOPATH%/src/github.com/golang/sys 


git clone https://github.com/golang/tools.git %GOPATH%/src/github.com/golang/tools ln -s %GOPATH%/src/github.com/golang $GOPATH/src/golang.org/x