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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 infrastructure133 Servers

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25 Sep 2025
@sternenseemann:systemli.orgsternihttps://cabal.readthedocs.io/en/stable/setup-commands.html#cmdoption-runhaskell-Setup.hs-configure-dependency15:26:31
@maralorn:maralorn.demaralornAh, nice.15:27:13
@maralorn:maralorn.demaralornThat’s less complicated than what I had in mind.15:27:28
@sternenseemann:systemli.orgsterniI think the problem here is figuring out the right installed package identifier. I believe how this is computed is pretty much internal to Cabal 15:27:35
@maralorn:maralorn.demaralorn You can most certainly not know it a nix eval time. So you will probably need to do some finding through build inputs. 15:28:33
26 Sep 2025
@bglgwyng:matrix.orgbglgwyng Maybe I'm doing something hacky so I want to convince my self;
did the same thing happen when we tried to override a pakcage with the same version in haskell.packages and different transitive dependencies?
03:28:54
@bglgwyng:matrix.orgbglgwyngyes this worked03:41:00
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@bglgwyng:matrix.orgbglgwyng Where is pkgsHostTarget passed from?
https://github.com/NixOS/nixpkgs/blob/5364a5ff96df5c2e3b1048914f90fc39530087c2/pkgs/development/haskell-modules/generic-builder.nix#L641
09:28:48
@sternenseemann:systemli.orgsternipkgs/stdenv/generic/setup.sh09:51:35

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