I can't find a reason why the m68k keyword was dropped. Can you please test =dev-perl/yaml-0.66 Thanks
*** Bug 237706 has been marked as a duplicate of this bug. ***
Was fixed nine month ago: http://sources.gentoo.org/viewcvs.py/gentoo-x86/dev-perl/yaml/yaml-0.68.ebuild?r1=1.1&r2=1.2