Just to repeat my concern about this patch: It gives the impression of
supporting CFLAGS, but doesn't really. There *is* a hard rule that
CFLAGS given to configure should override any options passed to
configure, and there is a reason for that: configure may guess
incorrectly, and may add options that actually conflict with the ones
that you are trying to pass in. For example, for Darwin, we add
-arch ppc -arch i386, so there is no way to not build a universal
binary anymore. Likewise, on SCO_SV, configure adds -Ki486 -DSCO5,
which may well be incorrect, and there would be no way to correct that.

Can you please agree that above description is factual wrt. the patch
you propose?

Therefore, I claim that this makes things more complex, and doesn't
solve an actual problem.