Since Gimp-Print has officially been renamed to Gutenprint a long while ago now, media-gfx/gimp-print should be renamed to media-gfx/gutenprint or net-print/gutenprint as well. Yes, this is a duplicate of bug 144623. But that was put on "resolved, later" half a year ago, and it now would seem logical to place >=5.0.0 under gutenprint and leave version 4 as gimp-print to eventually phase it out. At least that would match upstreams designation.
*** This bug has been marked as a duplicate of bug 144623 ***