> Currently, devel/SDL/Makefile.common doesn't include mk/ 
> x11.buildlink.mk,
> but instead relies upon aalib-x11 (!?) to include it by proxy; this
> seems less than optimal, especially if SDL were to be moved to the
> options framework and aalib-x11 were to be disabled.
>
> Is there some reason (perhaps for the Cocoa/Darwin) case that the x11
> buildlink file ought not to be included?
>

Correct. On Mac OS X, x11 should not be included, nor MesaLib (SDL  
uses OpenGL framework).
I would like to see a proper OpenGL handing in pkgsrc. :|

Kind regards,
Adam