Install this version:
emerge -a =dev-haskell/deriving-compat-0.6.7If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/deriving-compat-0.6.7Or alternatively:
emerge --autounmask-write -a =dev-haskell/deriving-compat-0.6.7# 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_FEATURES="lib profile haddock hoogle hscolour test-suite"
inherit haskell-cabal
DESCRIPTION="Backports of GHC deriving extensions"
HOMEPAGE="https://github.com/haskell-compat/deriving-compat"
LICENSE="BSD"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~arm64 ~ppc64 ~riscv ~x86"
RDEPEND=">=dev-haskell/th-abstraction-0.5:=[profile?] <dev-haskell/th-abstraction-0.8:=[profile?]
>=dev-haskell/transformers-compat-0.5:=[profile?]
>=dev-lang/ghc-9.0.2:=
"
DEPEND="${RDEPEND}
>=dev-haskell/cabal-3.4.1.0
test? ( >=dev-haskell/base-orphans-0.5 <dev-haskell/base-orphans-1
>=dev-haskell/hspec-1.8
>=dev-haskell/quickcheck-2 <dev-haskell/quickcheck-3
>=dev-haskell/tagged-0.7 <dev-haskell/tagged-1
>=dev-haskell/void-0.5.10 <dev-haskell/void-1 )
"
>=dev-haskell/th-abstraction-0.5:=[profile?] <dev-haskell/th-abstraction-0.8:=[profile?] >=dev-haskell/transformers-compat-0.5:=[profile?] >=dev-lang/ghc-9.0.2:= >=dev-haskell/cabal-3.4.1.0 test? ( >=dev-haskell/base-orphans-0.5 <dev-haskell/base-orphans-1 >=dev-haskell/hspec-1.8 >=dev-haskell/quickcheck-2 <dev-haskell/quickcheck-3 >=dev-haskell/tagged-0.7 <dev-haskell/tagged-1 >=dev-haskell/void-0.5.10 <dev-haskell/void-1 )
>=dev-haskell/th-abstraction-0.5:=[profile?] <dev-haskell/th-abstraction-0.8:=[profile?] >=dev-haskell/transformers-compat-0.5:=[profile?] >=dev-lang/ghc-9.0.2:=