yes,something different now: a compilefix for lisp code ;) the new ebuild applies the patch and adds ~amd64 to the useflags (works fine here,as the new sbcl does).
Created attachment 58912 [details, diff] maxima-5.9.1-unicode-fix.patch
Created attachment 58913 [details] maxima-5.9.1-r3.ebuild
This patch looks good. There is already something similar but not quite as complete in Portage right now. I'll look into it.
In Portage. Thanks for your work. (This is not marked ~amd64 yet as the dependencies need some work and testing has to be done.)