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I would suggest any attempts to build LuaJIT for RISC OS should be done with a cross compiler. Not only will it build an order of magnatude faster, it means the build environment is more like what most Makefiles will expect.
That's what I'm doing with iPhone (no other way), I think you also need your buildvm to be compiled with the same bits (32-bit), so if your host machine is 64-bit, make sure to use -m32, or on OSX -arch i386