Mac OS X open-source suffers from a lot of users and not a lot of contributers. You can whine about it, or you can help :).
You can grab it from the ticket
To use, download that Portfile and put it in a clean directory, download that patch file and put it in a “files” subdirectory off where you put the Portfile. In a console, change into the Portfile directory, and
sudo port -D . install
Please comment there or let me know if you hit any problems. If there's no issues, hopefully my changes will get accepted into the port soon.
(I haven't looked at the image_science situation yet – that's the next job.)