install_package "openssl-1.0.2g" "https://www.openssl.org/source/openssl-1.0.2g.tar.gz#b784b1b3907ce39abf4098702dade6365522a253ad1552e267a9a0e89594aa33" mac_openssl --if has_broken_mac_openssl
install_package "yaml-0.1.6" "http://pyyaml.org/download/libyaml/yaml-0.1.6.tar.gz#7da6971b4bd08a986dd2a61353bc422362bd0edcc67d7ebaac68c95f74182749" --if needs_yaml
install_package "ruby-2.0.0-preview1" "https://cache.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-preview1.tar.bz2#79e5605003bf6766fbd123ce00a0027df716ba6d28494c35185909f7e61a5bdf" standard verify_openssl