sci-mathematics/octave-3.0.3 was released on October. Is a bugfix release, so the same ebuild should work. I haven't tried it yet, I'm compiling it. Reproducible: Always
OK, it doesn't work, it fails at octave-3.0.1-test-fix.patch. I don't have time right now, I'll try to have a look at it tomorrow.
Thank you very much for the note. octave-3.0.3 is now in portage. Best, Markus