~/src/go-statsd-client> echo $GOPATH
/Users/me/gopath
~/src/go-statsd-client> echo $GOROOT
/usr/local/Cellar/go/1.1.1\\
~/src/go-statsd-client> go install
g
You need to setup both GOPATH and GOBIN. Make sure you have done the following (please replace ~/go with your preferred GOPATH and subsequently change GOBIN). This is tested on Ubuntu 16.04 LTS.
export GOPATH=~/go
mkdir ~/go/bin
export GOBIN=$GOPATH/bin
The selected answer did not solve the problem for me.