Install this version:
emerge -a =games-emulation/daphne-libretro-9999-r1
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =games-emulation/daphne-libretro-9999-r1
Or alternatively:
emerge --autounmask-write -a =games-emulation/daphne-libretro-9999-r1
# Copyright 2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
LIBRETRO_REPO_NAME="libretro/daphne"
inherit libretro-core
DESCRIPTION="Arcade laserdisc libretro core"
HOMEPAGE="https://github.com/libretro/daphne"
KEYWORDS="~amd64 ~x86"
LICENSE="GPL-2"
SLOT="0"
DEPEND=""
RDEPEND="${DEPEND}
games-emulation/libretro-info"
games-emulation/libretro-info