Install this version:
emerge -a =dev-perl/B-Flags-0.170.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-perl/B-Flags-0.170.0
Or alternatively:
emerge --autounmask-write -a =dev-perl/B-Flags-0.170.0
# Copyright 1999-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DIST_AUTHOR=RURBAN
DIST_VERSION=0.17
inherit perl-module
DESCRIPTION="Friendlier flags for B"
SLOT="0"
KEYWORDS="~amd64 ~arm64 ~riscv ~x86"
BDEPEND="
${RDEPEND}
virtual/perl-ExtUtils-MakeMaker
"