Install this version:
emerge -a =dev-haskell/stm-hamt-1.2.2.1
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/stm-hamt-1.2.2.1
Or alternatively:
emerge --autounmask-write -a =dev-haskell/stm-hamt-1.2.2.1
# 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 test-suite"
inherit haskell-cabal
DESCRIPTION="STM-specialised Hash Array Mapped Trie"
HOMEPAGE="https://github.com/nikita-volkov/stm-hamt"
LICENSE="MIT"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~x86"
RDEPEND="dev-haskell/deferred-folds:=[profile?]
dev-haskell/focus:=[profile?]
dev-haskell/hashable:=[profile?]
dev-haskell/list-t:=[profile?]
dev-haskell/primitive:=[profile?]
dev-haskell/primitive-extras:=[profile?]
dev-lang/ghc:="
DEPEND="${RDEPEND}"
BDEPEND="dev-haskell/cabal:=
test? ( dev-haskell/quickcheck
dev-haskell/rerebase
dev-haskell/tasty
dev-haskell/tasty-hunit
dev-haskell/tasty-quickcheck )"
src_prepare() {
haskell-cabal_src_prepare
sed -i '/license-file/d' stm-hamt.cabal || die "sed failed"
}
dev-haskell/deferred-folds:=[profile?] dev-haskell/focus:=[profile?] dev-haskell/hashable:=[profile?] dev-haskell/list-t:=[profile?] dev-haskell/primitive:=[profile?] dev-haskell/primitive-extras:=[profile?] dev-lang/ghc:=
dev-haskell/deferred-folds:=[profile?] dev-haskell/focus:=[profile?] dev-haskell/hashable:=[profile?] dev-haskell/list-t:=[profile?] dev-haskell/primitive:=[profile?] dev-haskell/primitive-extras:=[profile?] dev-lang/ghc:=
dev-haskell/cabal:= test? ( dev-haskell/quickcheck dev-haskell/rerebase dev-haskell/tasty dev-haskell/tasty-hunit dev-haskell/tasty-quickcheck )