Install this version:
emerge -a =dev-haskell/diff-1.0.2
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/diff-1.0.2
Or alternatively:
emerge --autounmask-write -a =dev-haskell/diff-1.0.2
# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
# ebuild generated by hackport 0.9.0.0.9999
CABAL_PN="Diff"
CABAL_FEATURES="lib profile haddock hoogle hscolour test-suite"
inherit haskell-cabal
DESCRIPTION="Diff algorithm in pure Haskell"
HOMEPAGE="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.4.6927"
LICENSE="BSD"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~arm64 ~ppc64 ~riscv ~x86"
RDEPEND=">=dev-lang/ghc-9.0.2:=
"
DEPEND="${RDEPEND}
>=dev-haskell/cabal-3.4.1.0
test? ( dev-haskell/quickcheck
dev-haskell/test-framework
dev-haskell/test-framework-quickcheck2 )
"
>=dev-lang/ghc-9.0.2:= >=dev-haskell/cabal-3.4.1.0 test? ( dev-haskell/quickcheck dev-haskell/test-framework dev-haskell/test-framework-quickcheck2 )
>=dev-lang/ghc-9.0.2:=