Create the /src/github.com/kelseyhightower
directory and clone the gls repo under it:
$ mkdir $GOPATH/src/github.com/kelseyhightower
$ cd $GOPATH/src/github.com/kelseyhightower
$ git clone https://github.com/kelseyhightower/gls.git
Run the build script:
$ ./build
$ sudo glsd
$ gls /