> Hmm sorry?  I meant "there are a bunch of packages in pkgsrc that
> actually put -D flags into CPPFLAGS".  If the reason behind the
> change in libxml2 is compatibility, then all other packages should
> be "fixed" too.

No, the reason behind was that it was broken and that was the first fix 
that came into mind.

> I can think of a maybe-complex tweak to the buildlink wrappers
> that could make -D usage transparent.  But before even we may even
> consider it, does pkgsrc work with such compilers ATM?  Which are
> these?  And at last, don't they have a -D equivalent?
>
Hmm, ancient^wearly sunpro cc versions come to mind. AFAIK, newer ones 
support "-D", but I don't know about all those other vendor cc's (AIX 
anyone?).

Cheers,
Marc