[MacRuby-devel] can I compile macruby on system 10.5.8?

Can I compile MacRuby on system 10.5.8? I'm having what looks like a simple issue, libyaml can't be found my miniruby: http://www.macruby.org/trac/ticket/449 I don't see how that would relate to 10.5.8 instead of SL but I thought I'd check before digging deeper.