devel/glib2/buildlink3.mk have another problem.

Previous version of glib2 uses internal pcre, but now using system pcre.
So glib2/buildlink3.mk try to buildlink pcre, but with old glib2,
pcre may not be installed, then failed to buildlink.
(For this situation, maybe we should remove pcre/buildlink.mk from glib2/buildlink3.mk.)

Is there general guidance such a issue?
"API and ABI isn't changed, but buildlink depend on the version of installed package"
-- 
"Of course I love NetBSD":-)
OBATA Akio / obata@lins.jp