I'd like to avoid as much as possible the preservation of generated files,
when using oasis.  _tags isn't a problem (likewise Makefile) since they
have a clear separation between what is customized, and what is
oasis-generated.  But setup.data does not have such a separation.

But I'd like to change things like "bindir", and probably other things
too.  Is there a way to specify such customizations in _oasis?

Thanks,
--chet--