install_package "rubinius-1.2.4" "http://asset.rubini.us/rubinius-1.2.4-20110705.tar.gz#403c777d19b3553e9cb36701fe002c5e" rbx
install_package "rubygems-1.6.2" "http://production.cf.rubygems.org/rubygems/rubygems-1.6.2.tgz#0c95a9869914ba1a45bf71d3b8048420" ruby