if [[ ! `ruby-build --version 2> /dev/null` =~ "20130222" ]]; then
        echo "Installing ruby-build v#{rubber_env.ruby_build_version}"
        wget -q https://github.com/sstephenson/ruby-build/archive/v20130222.tar.gz -O /tmp/ruby-build.tar.gz

        # Install ruby-build.
        tar -C /tmp -zxf /tmp/ruby-build.tar.gz
        cd /tmp/ruby-build-*
        ./install.sh

        # Clean up after ourselves.
        cd /root
        rm -rf /tmp/ruby-build-*
        rm -f /tmp/ruby-build.tar.gz

        # Get rid of RVM if this is an older rubber installation.
        if type rvm &> /dev/null; then
          echo -en "yes\n" | rvm implode

          rm -rf /usr/local/rvm
          rm -f /usr/bin/rvm*
          rm -f ~/.gemrc
        fi
      fi