InstallingRubyAndRake

First, install ruby via Yum.

  sudo yum install ruby

Now you can install rubygems from source

  wget http://rubyforge.org/frs/download.php/69365/rubygems-1.3.6.tgz
  tar -zxvf rubygems-1.3.6.tgz
  cd rubygems-1.3.6
  sudo ruby setup.rb

Now you can install rake

  sudo gem install rake