make dep 오류 질문좀요..

[asdasd(175.223)]

hi@hi-MS-7798:/usr/local/go/src/github.com/go-nebulas$ make dep
dep ensure -v
/usr/local/go/src/github.com/go-nebulas is not within a known GOPATH/src
Makefile:53: recipe for target 'dep' failed
make: *** [dep] Error 1

이렇게 나오는데 어떻게 하나요...