I've placed the next evolution of buildlink for X11 at:

	http://jgrind.org/~jlam/buildlink-for-x11.tgz

It has the same name as the tarball I had previously placed there.
Just extract it directly into /usr/pkgsrc.  It contains:

	mk/x11.buildlink.mk	[file]
	pkgtools/x11-links	[package]

If you have set USE_BUILDLINK_X11 anywhere, please _remove_ it, or else
things will break, as buildlink-x11 is no longer used by pkgsrc.  To use
the new files, if a package sets USE_X11 or USE_X11BASE, then add the
line:

	.include "../../mk/x11.buildlink.mk"

just before the inclusion of bsd.pkg.mk.  For most packages that use GNU
configure, nothing else needs to be changed.  For packages that don't use
GNU configure, then replace hard-coded references to /usr/X11R6 in the
sources with references to ${BUILDLINK_X11_DIR}.  Then just "make build".
This allows X11 packages to be strongly-buildlinked.

	Cheers,

	-- Johnny Lam <jlam@jgrind.org>