Install this version:
emerge -a =dev-haskell/mtl-prelude-2.0.3.2
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/mtl-prelude-2.0.3.2
Or alternatively:
emerge --autounmask-write -a =dev-haskell/mtl-prelude-2.0.3.2
# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
CABAL_FEATURES="lib profile haddock hoogle hscolour"
inherit haskell-cabal
DESCRIPTION="Reexports of most definitions from mtl and transformers"
HOMEPAGE="https://github.com/nikita-volkov/mtl-prelude"
LICENSE="MIT"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~x86"
RDEPEND="dev-lang/ghc:="
DEPEND="${RDEPEND}"
BDEPEND="dev-haskell/cabal:="
src_prepare() {
haskell-cabal_src_prepare
sed -i '/license-file/,+1d' mtl-prelude.cabal || die "sed failed"
}
dev-lang/ghc:=
dev-lang/ghc:=
dev-haskell/cabal:=