Install this version:
emerge -a =games-emulation/vita3k-9999
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =games-emulation/vita3k-9999
Or alternatively:
emerge --autounmask-write -a =games-emulation/vita3k-9999
# Copyright 2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
inherit git-r3 cmake
DESCRIPTION="Sony Playstation Vita Emulator"
HOMEPAGE="https://vita3k.org"
EGIT_REPO_URI="https://github.com/Vita3K/Vita3K.git"
LICENSE="GPL-2"
SLOT="0"
KEYWORDS="amd64 ~x86"
IUSE=""
DEPEND=""
RDEPEND="${DEPEND}"
BDEPEND="
dev-vcs/git
sys-devel/gcc
dev-util/ninja
dev-util/cmake
"
dev-vcs/git sys-devel/gcc dev-util/ninja dev-util/cmake