Install this version:
emerge -a =dev-perl/Chemistry-Elements-1.081
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-perl/Chemistry-Elements-1.081
Or alternatively:
emerge --autounmask-write -a =dev-perl/Chemistry-Elements-1.081
# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DIST_AUTHOR=BRIANDFOY
DIST_VERSION=${PV}
inherit perl-module
DESCRIPTION="Perl extension for working with Chemical Elements"
SLOT="0"
KEYWORDS="~amd64 ~x86"
SRC_TEST=do