Install this version:
emerge -a =dev-chicken/regex-2.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-chicken/regex-2.0
Or alternatively:
emerge --autounmask-write -a =dev-chicken/regex-2.0
# Copyright 1999-2026 Gentoo Authors # Distributed under the terms of the GNU General Public License v2 EAPI=8 inherit chicken-egg DESCRIPTION="Compatibility library for old regular expression API" HOMEPAGE="https://wiki.call-cc.org/eggref/5/regex" LICENSE="BSD" SLOT="0" KEYWORDS="~amd64 ~x86"