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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 infrastructure137 Servers

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22 Dec 2025
@amadaluzia:tchncs.deamadaluzia[tde] changed their display name from amadALTuzia (tchncs.de) to amadaluzia[tde].17:30:15
@magic_rb:matrix.redalder.orgmagic_rb how can i pass -Werror only in a Nix build? dont see a ghcFlags 21:54:45
@magic_rb:matrix.redalder.orgmagic_rb and buildFlags doesn't work 21:54:58
@maralorn:maralorn.demaralorn magic_rb: example here: https://github.com/maralorn/nix-output-monitor/blob/9a32f32f807a4f7bc97d95606465243f293650fe/flake.nix#L50 22:08:31
@magic_rb:matrix.redalder.orgmagic_rbThanks, i didnt think of passing it through cabal :D22:18:15
@maralorn:maralorn.demaralornI have no clue if this is the smartes solution.22:19:27
@magic_rb:matrix.redalder.orgmagic_rbHey if it works it works22:24:37
@magic_rb:matrix.redalder.orgmagic_rb It definitely wont be the dumbest/worst piece of the nix in the repo i want to put it in. I wrote that repos initial version years ago and boy was i an idiot 22:25:22
23 Dec 2025
@b:chreekat.netchreekatFun cabal fact: there's also a --ghc-options flag (with an s). Lets you put multiple, space separated ghc options in one go04:59:59
@magic_rb:matrix.redalder.orgmagic_rb the deps for microlens-mtl_0_2_1_1 are wrong, it pulls in microlens but it needs microlens_0_5_0_0 11:27:22
@alex:tunstall.xyzAlex
In reply to @magic_rb:matrix.redalder.org
the deps for microlens-mtl_0_2_1_1 are wrong, it pulls in microlens but it needs microlens_0_5_0_0
Nixpkgs does not do dependency solving.
Try overriding the haskell package set (see the Haskell section of the Nixpkgs manual).
15:33:07
@magic_rb:matrix.redalder.orgmagic_rbYeah i just overrode it manually for the deps, just kinda weird15:34:40
@magic_rb:matrix.redalder.orgmagic_rbThe versioned packages exist, but they dont depend on yeah other15:35:03

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