Install Ruby 1.9 on CentOS

In case you did not know and because I found out the hard way;

Attention: Ruby 1.9.2 now includes RubyGems so there's no need to install it separately. As a matter of fact, if you try doing so you will get an error like:

rubygems-1.3.7/lib/rubygems/source_index.rb:68:in `installed_spec_directories': undefined method `path' for Gem:Module (NoMethodError

Ref: http://www.freshblurbs.com/install-ruby-1-9-centos