I've used kde-misc/katapult-0.3.1.1 on x86 from the day it was added to portage, and now using kde-misc/katapult-0.3.1.2. They both run perfectly on x86; enough to add ~x86 to KEYWORDS :-) Thanks!
Works fine on x86 for me, too.
added ~x86 to both version's. Thank you for reporting that it works on x86.