Install this version:
emerge -a =app-emacs/base16-theme-20260412.231
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =app-emacs/base16-theme-20260412.231
Or alternatively:
emerge --autounmask-write -a =app-emacs/base16-theme-20260412.231
# automatically generated by g-sorcery
# please do not edit this file
EAPI=8
REPO_URI="https://melpa.org/packages/"
SOURCE_TYPE="tar"
REALNAME="base16-theme"
DIGEST_SOURCES="yes"
inherit g-sorcery gs-elpa
DESCRIPTION="Collection of themes built on combinations of 16 base colors"
HOMEPAGE="https://github.com/tinted-theming/base16-emacs"
SRC_URI="${REPO_URI}${REALNAME}-${PV}.${SUFFIX}"
SLOT="0"
KEYWORDS="~amd64 ~x86"
DEPEND=""
RDEPEND=""