PSA: keep your $GOPATH neat

[David Cheney]

I think Gustavo has already raised an issue about this, but the short form version is: Keep your $GOPATH clean of anything but go code. 

The go tool appears to be walking a lot more (possibly everything) than it should when you issue commands like go test or go install. 

Certainly don't do as I did and keep a copy of gcc-4.7.1 in your $GOPATH/src

Cheers

Dave