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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 infrastructure134 Servers

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10 Dec 2025
@iopq:matrix.orgiopqhow do I do that14:04:18
@maralorn:maralorn.demaralornhttps://nix.dev/reference/pinning-nixpkgs.html14:20:02
@mequbic:matrix.orgiqubic (she/her)Is it possible for me to just mark this as unbroken and also skip the tests too?16:20:17
@iopq:matrix.orgiopq I use stack build, how do I pin a nixpkgs version while doing that 16:21:47
@maralorn:maralorn.demaralornYes, just apply both functions in sequence.16:31:12
@mequbic:matrix.orgiqubic (she/her)Got it.16:31:24
@mequbic:matrix.orgiqubic (she/her)Lets see if this works.16:31:29
@maralorn:maralorn.demaralornOh, you mean you are using the stack nix integration?16:31:47
@maralorn:maralorn.demaralornI think stack tries to load the environment from a shell.nix in the same dir?16:32:08
@maralorn:maralorn.demaralornSo if you pin nixpkgs in that shell.nix it might work? But better double check this via looking into the stack documentation.16:32:34
@mequbic:matrix.orgiqubic (she/her) If it doesn't I have one more thing to try. I know that my main NixOS config is building the latest version of XMonad from the Hackage, and I can just modify that to build sbv 16:32:40
@mequbic:matrix.orgiqubic (she/her) * If it doesn't I have one more thing to try. I know that my main NixOS config is building the latest version of XMonad from the Hackage, and I can just modify that to build the actual latest sbv 16:32:57
@iopq:matrix.orgiopqthere is no shell.nix in that folder though16:33:01
@maralorn:maralorn.demaralornThen create one? But it might just not work because I am not a stack user and haven’t memorized the documentation.16:34:16
@mequbic:matrix.orgiqubic (she/her)

maralorn: This seems to be working for me:

 GNU nano 8.7                                        shell.nix
{ pkgs ? import <nixpkgs> {} }:
let
  src = pkgs.nix-gitignore.gitignoreSource [] ./.;
  unbrokenSbv = pkgs.haskell.lib.compose.unmarkBroken pkgs.haskell.packages.ghc912.sbv_12_2;
  myPkg = pkgs.haskell.packages.ghc912.callCabal2nix "aoc25" src { sbv = pkgs.haskell.lib.compose.dontCheck unbro>
in
pkgs.stdenv.mkDerivation {
  name = "aoc-shell";

  buildInputs = [
    myPkg.env.nativeBuildInputs

    pkgs.cabal-install
    pkgs.haskell.packages.ghc912.haskell-language-server

    pkgs.z3
  ];
}
16:40:11
@mequbic:matrix.orgiqubic (she/her) *

maralorn: This seems to be working for me:

{ pkgs ? import <nixpkgs> {} }:
let
  src = pkgs.nix-gitignore.gitignoreSource [] ./.;
  unbrokenSbv = pkgs.haskell.lib.compose.unmarkBroken pkgs.haskell.packages.ghc912.sbv_12_2;
  myPkg = pkgs.haskell.packages.ghc912.callCabal2nix "aoc25" src { sbv = pkgs.haskell.lib.compose.dontCheck unbro>
in
pkgs.stdenv.mkDerivation {
  name = "aoc-shell";

  buildInputs = [
    myPkg.env.nativeBuildInputs

    pkgs.cabal-install
    pkgs.haskell.packages.ghc912.haskell-language-server

    pkgs.z3
  ];
}
16:40:26
@mequbic:matrix.orgiqubic (she/her) maralorn: And my solution to the Advent of Code puzzle last night was correct. 16:54:01
@mequbic:matrix.orgiqubic (she/her)When I built with tests, about 100 out of 80,000 failed. I guess that's why it's broken.16:54:28
@mequbic:matrix.orgiqubic (she/her) maralorn: Thanks for your help. I'll be going now! 17:07:38
@peddie:matrix.orgpeddielast I checked, the sbv tests failed because they are golden output tests and when nixpkgs runs them, it invokes the smt solver by its full path rather than just by executable name, so the exact output doesn't match? not sure how or whether this can be resolved. but I bet the tests are otherwise ok23:20:42
11 Dec 2025
@andromeda:tchncs.deandromedacabal2nix is to me actually quite pleasant05:25:53
@andromeda:tchncs.deandromedaso in Setup.hs, when I need to locate the Wayland protocols, I'm thinking I have a cabal flag to use Nix. In the Setup.hs file, if this nix flag is flown, the protocols will be found in the wayland-protocols nixpkg. Otherwise, they will be found in the 'normal' place. Does that track?05:52:59
@maralorn:maralorn.demaralorn custom setup.hs is not very popular 08:35:48
@maralorn:maralorn.demaralornWould probably be better if there were a proper way to discover Wayland-protocols but I have no clue if there is08:36:45
@maralorn:maralorn.demaralorn I.g. if it works it works 08:37:14
@magic_rb:matrix.redalder.orgmagic_rb Please dont call nix in setup.hs, you need to somehow get it in via env var 08:38:39
@magic_rb:matrix.redalder.orgmagic_rb Then you dont need a flag, if set NIX_WAYLAND_PROTOCOLS then 08:38:57
@magic_rb:matrix.redalder.orgmagic_rb Call nix in setup.hs will make it impossible to build in a nix sandbox without the recursive-nix feature 08:39:47
@magic_rb:matrix.redalder.orgmagic_rb * Calling nix in setup.hs will make it impossible to build in a nix sandbox without the recursive-nix feature 08:40:31
@magic_rb:matrix.redalder.orgmagic_rbOr some other container/vm fuckery08:40:40

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