sudo apt-get update
sudo apt-get install gcc
sudo apt-get install make
sudo apt-get install build-essential
sudo apt-get install zlib1g-dev libssl-dev libreadline-dev libyaml-dev libxml2-dev libxslt-dev
cd /usr/src/
sudo wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.1.tar.gz