Install this version:
emerge -a =dev-racket/elf-9999
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-racket/elf-9999
Or alternatively:
emerge --autounmask-write -a =dev-racket/elf-9999
# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
PROPERTIES=live
inherit racket
DESCRIPTION="Unix executable and linking format read/writing"
HOMEPAGE="https://pkgs.racket-lang.org/package/elf"
S="${WORKDIR}/${PN}"
LICENSE="all-rights-reserved"
SLOT="0"
KEYWORDS="~amd64 ~arm ~ppc ~ppc64 ~x86"
RESTRICT="mirror"
src_unpack() {
wget -O "${T}/elf.zip" "http://code_man.cybnet.ch/racket/elf.zip"
unpack "${T}/elf.zip"
}