RPC is not maintained anymore. It is succeeded by orpie, found at http://www.eecs.umich.edu/~pelzlpj/orpie/ This should also fix Bug #63965 I've made an ebuild for orpie and will attach it to this report.
Created attachment 41143 [details] Ebuild for orpie-1.4.1 Ebuild as described above. I would recommend to put it into app-sci rather than app-misc since it's sort of a scientific calculator.
Created attachment 41144 [details] Ebuild for orpie-1.4.1 with fixed CVS header Sorry. I had my CVS header in the ebuild. Fixed.
I've put the report of Bug #63965 into CC, since he might be interested in this ebuild.
I'm going to throw this over to sci since I don't want to maintain orpie.
*** Bug 74292 has been marked as a duplicate of this bug. ***
"sci-calculators/orpie" os now in Portage.