* In order to avoid wasting time, backtracking has terminated early
 * due to the above autounmask change(s). The --autounmask-backtrack=y
 * option can be used to force further backtracking, but there is no
 * guarantee that it will produce a solution.

!!! All ebuilds that could satisfy ">=media-gfx/graphite2-1.2.1:=[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?]" have been masked.
!!! One of the following masked packages is required to complete your request:
- media-gfx/graphite2-1.3.11::gentoo (masked by: ~amd64 keyword)
- media-gfx/graphite2-1.3.10::gentoo (masked by: )

(dependency required by "media-libs/harfbuzz-1.8.1::gentoo" [ebuild])
(dependency required by "x11-libs/pango-1.40.14-r1::gentoo" [ebuild])
(dependency required by "gnome-base/librsvg-2.40.18::gentoo" [ebuild])
(dependency required by "x11-libs/gtk+-2.24.32::gentoo" [ebuild])
(dependency required by "www-client/firefox-52.8.0::gentoo" [installed])
(dependency required by "@selected" [set])
(dependency required by "@world" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.