Starting from maxima-5.17.1-r1, it does not install imaxima; instead, it PDEPENDs on app-emacs/imaxima. But imaxima does not have ~sparc keyword. So, I had to remove ~sparc from maxima - not good. Please keyword imaxima, then I'll restore ~sparc in maxima.
keyworded ~arch for sparc, closing
I've restored the ~sparc keyword in maxima.
Strange. I was sure I've done this already (on 26 Mar, as ChangeLog in my copy of the tree says). Forgot to commit? Strange. Thanks.