Install system wide go
nix-env -iA ....
Download source code and compile it
mkdir -p ${GOPATH}/bootstrap
tar xzf .... -C ${GOPATH}/bootstrap
cd ${GOPATH}/bootstrap/src
./make.bash
Build a binary to cross compile
export GO_BOOTSTRAP=${GOPATH}/bootstrap
cd $(go env GOROOT)
cd src
sudo GOROOT_BOOTSTRAP=${GOROOT_BOOTSTRAP} GOOS=linux GOARCH=amd64 ./make.bash