In Factory it should be OK, both `ruby19` and `ruby20` require `libyaml-0-2`, see https://build.opensuse.org/package/binary/openSUSE:Factory/ruby20?arch=x86_64&filename=ruby20-2.0.0.p247-2.1.x86_64.rpm&repository=standard and https://build.opensuse.org/package/binary/openSUSE:Factory/ruby19?arch=x86_64&filename=ruby19-1.9.3.p448-1.1.x86_64.rpm&repository=standard.