Install this version:
emerge -a =dev-perl/POE-Component-Client-Keepalive-0.272.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-perl/POE-Component-Client-Keepalive-0.272.0
Or alternatively:
emerge --autounmask-write -a =dev-perl/POE-Component-Client-Keepalive-0.272.0
# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DIST_AUTHOR=RCAPUTO
DIST_VERSION=0.272
inherit perl-module
DESCRIPTION='Manage connections, with keep-alive'
SLOT="0"
KEYWORDS="~amd64 ~x86"
RDEPEND="
>=dev-perl/Net-IP-Minimal-0.20.0
>=dev-perl/POE-1.311.0
>=dev-perl/POE-Component-Resolver-0.917.0
"
BDEPEND="${RDEPEND}
>=virtual/perl-ExtUtils-MakeMaker-6.300.0
"
>=dev-perl/Net-IP-Minimal-0.20.0 >=dev-perl/POE-1.311.0 >=dev-perl/POE-Component-Resolver-0.917.0
>=dev-perl/Net-IP-Minimal-0.20.0 >=dev-perl/POE-1.311.0 >=dev-perl/POE-Component-Resolver-0.917.0 >=virtual/perl-ExtUtils-MakeMaker-6.300.0