[CR] Derailleur Hanger help

Hi all, I am on the hunt for a decent 531 or similar frame to build up into a commuting road bike, and am inexperienced in bike building. Looking at this fixie-fied Poyner bike - http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=190391239088&ssPageName=ADME:X:RTQ:GB:1123 - the seller tells me that it can't be readapted into a geared bike because the derailleur hanger has been removed. Would it be possible to get a new derailleur hanger ("adapter claw" in Sheldon Brown-ese) that fitted into the axle slot?
Thanks,
Mike