The version 3.6.1 of kbiff is bugged and the author already launch other versions, please update the ebuild! I already have a version of an ebuild to kbiff-3.6.3, but I do not know how to post it :-)
Created attachment 6206 [details] Ebuild to new kbiff
Created attachment 6207 [details] This is the digest to the kbiff-3.6.3 Put this file in the directory /usr/portage/net-mail/kbiff/files/
Committed new ebuild to portage.