or are the original Makefile author

Ahem. RTFM. You get that error on x86 too unless you do "make BUILD=car2 ARCH=pc emptool", as explained in README.srcrel. Unless there's something weirder going on.

This is however likely to be the least of your problems . Is your Alpha little-endian? What's sizeof(int)? sizeof(void*)? (Presumably sizeof(long) is 8)

Peter