leopard install

Hi I am running a fresh install. I have searched through the mails and havent seen this (though maybe i missed it!). I using leopard, got the dmg MacPorts-1.5.0-10.5.dmg and ran the installer. It seems to hang about 70-80% of the way through. Is this a known issue? 1.8GHz PowerPC G5. Thanks Eoghan