Golang：当作为makefile的一部分被调用的时候，构build失败

我有以下make文件：

default: builddocker setup: go get github.com/golang/protobuf/proto go get github.com/golang/protobuf/protoc-gen-go go get golang.org/x/net/context go get google.golang.org/grpc buildgo: CGO_ENABLED=0 GOOS=linux go build -ldflags "-s" -a -installsuffix cgo -o main ./customer-server/ builddocker: docker build -t johnwesonga/grpc/customer-server -f ./Dockerfile.build . docker run -t johnwesonga/grpc/customer-server /bin/true docker cp `docker ps -q -n=1`:/main . chmod 755 ./main docker build --rm=true --tag=johnwesonga/grpc/customer-server -f Dockerfile.static . 

我的Dockerfile.build有：

 FROM golang ADD Makefile / WORKDIR / RUN make setup RUN make buildgo CMD ["/bin/bash"] 

但是每次运行“make builddocker”时都会出现以下错误：

 CGO_ENABLED=0 GOOS=linux go build -ldflags "-s" -a -installsuffix cgo -o main ./customer-server/ can't load package: package ./customer-server: open /customer-server: no such file or directory make: *** [buildgo] Error 1 Makefile:10: recipe for target 'buildgo' failed The command '/bin/sh -c make buildgo' returned a non-zero code: 2 make: *** [builddocker] Error 2 

但是，如果我运行“Make buildgo”，它工作得很好，任何想法，为什么这是失败？

仅供参考我的源代码树如下：

 /go/src/github.com/johnwesonga/grpc/MakeFile /go/src/github.com/johnwesonga/grpc/customer-server /go/src/github.com/johnwesonga/grpc/customer-server/main.go