I've done this sort of thing for a while (if in a simpler, more naive way) by just tweaking GOPATH in a Makefile. In fact, I had to do it again only yesterday, for a very simple little server: https://github.com/rcarmo/go-http-mdns

In general, I think a solution for this is long overdue, and look forward to trying out 1.5 in earnest.