Install this version:
emerge -a =dev-haskell/base64-1.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/base64-1.0
Or alternatively:
emerge --autounmask-write -a =dev-haskell/base64-1.0
# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
# ebuild generated by hackport 0.8.5.1.9999
CABAL_HACKAGE_REVISION=1
CABAL_FEATURES="lib profile haddock hoogle hscolour test-suite"
inherit haskell-cabal
DESCRIPTION="A modern Base64 library"
HOMEPAGE="https://github.com/emilypi/base64"
LICENSE="BSD"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~arm64"
RDEPEND=">=dev-haskell/text-2.0:=[profile?] <dev-haskell/text-2.3:=[profile?]
>=dev-haskell/text-short-0.1:=[profile?] <dev-haskell/text-short-0.2:=[profile?]
>=dev-lang/ghc-9.2.4:=
"
DEPEND="${RDEPEND}
>=dev-haskell/cabal-3.6.3.0
test? ( dev-haskell/base64-bytestring
dev-haskell/quickcheck
dev-haskell/random-bytestring
dev-haskell/tasty
dev-haskell/tasty-hunit
dev-haskell/tasty-quickcheck )
"
>=dev-haskell/text-2.0:=[profile?] <dev-haskell/text-2.3:=[profile?] >=dev-haskell/text-short-0.1:=[profile?] <dev-haskell/text-short-0.2:=[profile?] >=dev-lang/ghc-9.2.4:= >=dev-haskell/cabal-3.6.3.0 test? ( dev-haskell/base64-bytestring dev-haskell/quickcheck dev-haskell/random-bytestring dev-haskell/tasty dev-haskell/tasty-hunit dev-haskell/tasty-quickcheck )
>=dev-haskell/text-2.0:=[profile?] <dev-haskell/text-2.3:=[profile?] >=dev-haskell/text-short-0.1:=[profile?] <dev-haskell/text-short-0.2:=[profile?] >=dev-lang/ghc-9.2.4:=