Gear Hub fan
Join Date: Nov 2008
Location: Reno, NV
Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega
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Remove the rear derailleur and see if it is the mounting hole or the bolt that is stripped. If it is the mounting hole then it can be repaired using a Helicoil or similar thread repair insert with the proper thread I would think. Check with your LBS as to whether they can do it.
Many modern frames, aluminum and CF, have replaceable derailleur hangers. If so then order a new hanger and install it.