i can't find 10.5 Intel system files listed in https://trac.macports.org/ticket/53184

So i have tried to virtualize on virtualbox (intel pc w10 ) leopard. i'd like to build universal (x86/ppc32) app ; but virtual machine doesn't start frown
i have tried to follow this guide http://www.sysprobs.com/install-mac-os-1055-leopard-virtualbox-314-installation-dvd , but i have use the last vbox frown
any idea?