Calculating dependencies   
!!! All ebuilds that could satisfy "sys-libs/libstdc++-v3" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-libs/libstdc++-v3-3.3.3-r1 (masked by: ~x86 keyword)
- sys-libs/libstdc++-v3-3.3.4 (masked by: ~x86 keyword)
- sys-libs/libstdc++-v3-3.3.6 (masked by: ~x86 keyword)