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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://nixos.org/manual/nixpkgs/unstable/#haskell | Current PR: https://github.com/nixos/nixpkgs/pulls?q=is%3Apr+is%3Aopen+head%3Ahaskell-updates | Maintainer Docs: https://github.com/NixOS/nixpkgs/blob/haskell-updates/pkgs/development/haskell-modules/HACKING.md | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org | Merger Schedule: https://cloud.maralorn.de/apps/calendar/p/H6migHmKX7xHoTFa/dayGridMonth/now | Join #haskell.nix:libera.chat for question about the alternative haskell.nix infrastructure135 Servers

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17 Dec 2025
@maralorn:maralorn.demaralornLooks like a minor bump so I don’t see good reason.19:19:04
@maralorn:maralorn.demaralornWait.19:19:45
@maralorn:maralorn.demaralornI am looking at 22.44 which is outdated. It doesn’t seem to be part of our current LTS.19:20:05
@maralorn:maralorn.demaralornthen 👆️19:20:30
@lenny:flipdot.orgLenny.oki thx!19:22:51
@maralorn:maralorn.demaralornYour bump might be in here, but github feilds to load it for me: https://github.com/NixOS/nixpkgs/pull/46625819:32:03
@maralorn:maralorn.demaralorn* Your bump might be in here, but github fails to load it for me: https://github.com/NixOS/nixpkgs/pull/46625819:32:14
@lenny:flipdot.orgLenny.yes it actually it! ty I'll watch that19:37:24
@maralorn:maralorn.demaralorn May I pitch you my bot nixpkgs-bot. Send it "subscribe 466258" and you will be informed when it is merged and when it reaches master and nixos-unstable. 😄 19:41:21
@sternenseemann:systemli.orgsterni
In reply to @ncfavier:matrix.org
Is there a way to override the version of Cabal used to build Setup.hs? lhs2tex needs Cabal 3.10, but using the obvious override doesn't work (I suspect because Cabal 3.12 is bundled with GHC and it picks the latest available version). I also found https://github.com/NixOS/nixpkgs/pull/443130 but that doesn't seem to help here.
you can add the version you want to setupHaskellDepends but if i recall it picks the most recent version by default
20:42:08
@sternenseemann:systemli.orgsterniso you may need to coax it with some extra flags20:43:01
@andromeda:tchncs.deandromeda"the eleven copies of GHC in your nix store don't exist, they can't hurt you" the eleven copies of GHC in my nix store: 🫥23:05:24
@maralorn:maralorn.demaralorn😄23:06:42

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