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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://haskell4nix.readthedocs.io/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org145 Servers

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19 Dec 2025
@sternenseemann:systemli.orgsterni (he/him)ofc 9.14.1 releases when i leave the house without my laptop15:23:59
21 Dec 2025
@ashinnv:matrix.orgMr Mayhem changed their display name from Magnolia Mayhem to Mr Mayhem.20:57:53
22 Dec 2025
@cinerealkiara:matrix.org@cinerealkiara:matrix.org left the room.13:12:27
@amadaluzia:tchncs.deamadaluzia[tde] changed their display name from ➡️@amadaluzia:unredacted.org to amadALTuzia (tchncs.de).16:11:31
@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
@b:chreekat.netchreekatI believe that all the versioned packages are just there because they can be with no guarantees17:06:45
@b:chreekat.netchreekat * 17:06:57
@magic_rb:matrix.redalder.orgmagic_rbFair fair, thought it was an oversight :)17:35:00
26 Dec 2025
@magthe:tchncs.deMagnusDid `ghc9103` get dropped from 25.11? Only the native-bignum variant is present still.16:03:58
@magthe:tchncs.deMagnusSomehow `ghc910` is listed as version 9.10.3 still though.16:11:13
@emilazy:matrix.orgemilyisn't that because GMP or whatever was removed upstream?16:11:14
@emilazy:matrix.orgemily ah, no, that was integer-simple 16:11:52
@emilazy:matrix.orgemily9.10.3 looks there to me https://github.com/NixOS/nixpkgs/blob/nixos-25.11/pkgs/top-level/haskell-packages.nix16:12:02
@magthe:tchncs.deMagnusI don't see it at https://search.nixos.org/packages?channel=25.11&query=ghc91016:16:51
@emilazy:matrix.orgemily it's just being deduplicated with haskell.compiler.ghc910 pretty sure. search is weird. 16:18:03
@emilazy:matrix.orgemilythe minor version attributes aren't very supported AIUI16:18:10
@emilazy:matrix.orgemilyer, the patch version ones that is16:18:14
@emilazy:matrix.orgemily you should say ghc910 rather than ghc9103 16:18:22

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