A quick search has not shown up a driver that you can download and install. Anything I found needs to be compiled.
It may be worth cutting your losses and getting an adapter that is plug and play on Rune/Arch. I use these to good effect:
http://www.ebay.co.uk/itm/271928946887?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT