Install this version:
emerge -a =dev-perl/Term-ReadLine-TTYtter-1.400.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-perl/Term-ReadLine-TTYtter-1.400.0
Or alternatively:
emerge --autounmask-write -a =dev-perl/Term-ReadLine-TTYtter-1.400.0
# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DIST_AUTHOR=CKAISER
DIST_VERSION=1.4
inherit perl-module
DESCRIPTION="Quick implementation of readline utilities for ttytter"
SLOT="0"
KEYWORDS="~amd64 ~x86"
PATCHES=( "${FILESDIR}/${PN}-1.4-nointeractive.patch" )
RDEPEND="
dev-perl/TermReadKey
"