require_gcc
install_package "yaml-0.1.5" "http://pyyaml.org/download/libyaml/yaml-0.1.5.tar.gz#24f6093c1e840ca5df2eb09291a1dbf1" --if needs_yaml
install_package "ruby-1.9.3-rc1" "http://cache.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-rc1.tar.gz#46a2a481536ca0ca0b80ad2b091df68e"