Install Ruby 1.9.x on Ubuntu from sources

setup_ruby19.sh

echo "Install Ruby..."

sudo apt-get update
sudo apt-get install build-essential libssl-dev zlib1g-dev libreadline-dev  

export ruby_version=1.9.3-p194
cd /usr/src
sudo wget "http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-$ruby_version.tar.bz2"
sudo tar xf "./ruby-$ruby_version.tar.bz2"
sudo rm "./ruby-$ruby_version.tar.bz2"
cd "./ruby-$ruby_version"
sudo ./configure
sudo make
sudo make install

echo "RUBYOPT=-Ku" | sudo tee -a /etc/environment

sudo tee -a /etc/gemrc <<EOF
---
gem: --no-rdoc --no-ri
EOF

ln -s /etc/gemrc ~/.gemrc

echo "Ruby installed"