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Commenting the Makefile lines corresponding to the above
problematic target, the compilation still failing for
another targets:

make: *** No rule to make target `stm_h_oneind.o', needed by
`rb_stm_h_oneind'. Stop.
app0 lockfree-lib]$

and this one too:

make: *** No rule to make target `stm_fraser_nosearch.o',
needed by `rb_stm_fraser_nosearch'. Stop.
app0 lockfree-lib]$

After all of these targets are removed, compilation complains.

Bye,
Duilio.