使用Homebrew安装Go项目时出错

Now I try to install any go project with brew but I get the same error

➜ brew install etcd
==> Installing etcd dependency: go
==> Downloading https://storage.googleapis.com/golang/go1.4.src.tar.gz
Already downloaded: /Library/Caches/Homebrew/go-1.4.tar.gz
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> ./make.bash --no-clean
...

I'm sorry to bother you. It works after a few minutes. Maybe it's the problem of go 1.4 but finally it works.

==> ./make.bash --no-clean
==> ./make.bash --no-clean
==> Caveats
As of go 1.2, a valid GOPATH is required to use the go get command:
http://golang.org/doc/code.html#GOPATH

go vet and go doc are now part of the go.tools sub repo:
http://golang.org/doc/go1.2#go_tools_godoc

To get go vet and go doc run:
go get golang.org/x/tools/cmd/vet
go get golang.org/x/tools/cmd/godoc

You may wish to add the GOROOT-based install location to your PATH:
export PATH=$PATH:/usr/local/opt/go/libexec/bin
==> Summary