Consider this as official QA warning about ignoring end-quiz question 19. and the proper way of handling features that don't work on specific arch. http://sources.gentoo.org/viewcvs.py/gentoo-x86/media-gfx/sane-backends/sane-backends-1.0.20-r3.ebuild?r1=1.1&r2=1.2 http://sources.gentoo.org/viewcvs.py/gentoo-x86/media-gfx/sane-backends/ChangeLog?r1=1.167&r2=1.168 http://sources.gentoo.org/viewcvs.py/gentoo-x86/profiles/arch/x86/ChangeLog?r1=1.29&r2=1.30 http://sources.gentoo.org/viewcvs.py/gentoo-x86/profiles/arch/amd64/ChangeLog?r1=1.73&r2=1.74 http://sources.gentoo.org/viewcvs.py/gentoo-x86/profiles/base/ChangeLog?r1=1.130&r2=1.131
And closing, since it's now fixed.