apt-get install bison
wget https://storage.googleapis.com/golang/go1.4.3.linux-amd64.tar.gz
mkdir $HOME/go1.4
tar -C $HOME/go1.4 -xzf go1.4.3.linux-amd64.tar.gz
export GOROOT_BOOTSTRAP=$HOME/go1.4/go
bash < <(curl -s -S -L https://raw.githubusercontent.com/moovweb/gvm/master/binscripts/gvm-installer
source /root/.gvm/scripts/gvm
gvm install go1.5.1
gvm use go1.5.1