> I cannot try right but I don't think it wil work:

> 2.) "x11/libXcursor" doesn't have a "builtin.mk".

Currently buildlink3.mk includes "../../x11/xcursor/buildlink3.mk" 
(when native).

And then the mk/buildlink3/bsd.buildlink3.mk will sinclude the builtin.mk 
for xcursor. So I am hoping that without PREFER_PKGSRC=xcursor, the 
builtin.mk will use your BUILTIN version.

> > I think next problem then after that will be to get the x11-links updated 
> > for missing files, like missing pc files.
> 
> That is actually a requirement to get Mac OS 10.5 supported.