gnubiff-2.1.9 breaks password saving support by not passing the myconf variable to econf. i guess line 32 should read 32 econf $(use_enable gnome) $(use_enable nls) ${myconf} || die
See bug #133325 for new ebuild.
fixed, thanks http://sources.gentoo.org/viewcvs.py/gentoo-x86/net-mail/gnubiff/gnubiff-2.1.9.ebuild?r1=1.3&r2=1.4