I noticed that at least ~sparc isn't in the ebuild file for rxvt. I've
compiled it on several sparc platforms now. I don't see why it shouldn't be
Steps to Reproduce:
1. add ~sparc to ebuild
2. emerge rxvt
rxvt installed just fine
This works for me as well. Added sparc to keyword and commited change to portage.
Keyword added, closing.