!!! resolution failed
!!! request ( ( ('repo.livefs',) EqualityMatch: =False || ( ('category',) == virtual && ('package_is_real',) EqualityMatch: =False ) ) && =app-emulation/grub-xen-host-1.0-r2 ), mode none
!!! trying app-emulation/grub-xen-host-1.0-r2
!!!   request sys-boot/grub:2=[grub_platforms_xen], mode depend
!!!   trying sys-boot/grub-2.16-r1
!!!     failed due to failed inserting: [<PackageWrapper pkg=<<class 'pkgcore.ebuild.ebuild_src.package'> cpv='sys-boot/grub-2.16-r1' @0x106b90e10> wrapped='use' @0x106be4cd0>]
!!!   trying sys-boot/grub-2.14-r5
!!!     request >=sys-boot/grub-themes-gentoo-1.0-r1, mode rdepend
!!!     trying sys-boot/grub-themes-gentoo-1.0-r2
!!!       pdepend cycle on sys-boot/grub: limiting to vdb
!!!       request sys-boot/grub, mode pdepend
!!!       removing choices involving sys-boot/grub
!!!     removing choices involving >=sys-boot/grub-themes-gentoo-1.0-r1
!!!   removing choices involving sys-boot/grub:2=[grub_platforms_xen]

Failures encountered:
!!! failed '( ( ('repo.livefs',) EqualityMatch: =False || ( ('category',) == virtual && ('package_is_real',) EqualityMatch: =False ) ) && =app-emulation/grub-xen-host-1.0-r2 )'
potentials:
repo gentoo: [ ebuild src: app-emulation/grub-xen-host-1.0-r2 ]