I used ekeyword to add ~ppc64 to the jedit-4.2-r1.ebuild.
I haven't tested extensively, but preliminary tests suggest that the ~ppc64 keyword should be added to the ebuild.
(This is my first bug report of this type; the docs seemed to suggest that this was the correct way to report this kind of thing; my apologies in advance if that's not true.)
Steps to Reproduce:
added ~ppc64 to KEYWORDS