Install this version:
emerge -a =dev-haskell/managed-1.0.11
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/managed-1.0.11
Or alternatively:
emerge --autounmask-write -a =dev-haskell/managed-1.0.11
# 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="A monad for managed values"
HOMEPAGE="https://hackage.haskell.org/package/managed"
LICENSE="BSD"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~x86"
DEPEND="${RDEPEND}"
BDEPEND="dev-haskell/cabal"
src_prepare() {
haskell-cabal_src_prepare
sed -i '/License-file/d' managed.cabal || die "sed failed"
}