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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/139 Servers

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15 Sep 2025
@emilazy:matrix.orgemily you should of course autoreconfHook and get it on latest autotools 13:59:10
@alex:tunstall.xyzAlexThanks for the advice. I'll take a look when I get to work on the PRs.14:05:39
@bglgwyng:matrix.orgbglgwyngI realized that I diagnosed the issue wrong15:02:06
@bglgwyng:matrix.orgbglgwyng 
{
        packages.zlib1 = (pkgs.haskellPackages.zlib).override { zlib = pkgs.zlib; };
        # it works
        packages.zlib2 = (pkgs.haskellPackages.callCabal2nix "zlib" inputs.zlib-src { }).override { zlib = pkgs.zlib; };
        # it works
        packages.splitmix1 = (pkgs.haskellPackages.splitmix).override { testu01 = null; };
        # it doesn't work
        packages.splitmix2 = (pkgs.haskellPackages.callCabal2nix "splitmix" inputs.splitmix-src { }).override { testu01 = null; };
      };

Only the last one failed with 'error: function 'anonymous lambda' called without required argument 'testu01''

15:02:33
@bglgwyng:matrix.orgbglgwyngHere is the reproducer https://github.com/bglgwyng/haskellPackages-override15:02:59
@bglgwyng:matrix.orgbglgwyng * 
{
        packages.zlib1 = (pkgs.haskellPackages.zlib).override { zlib = pkgs.zlib; };
        # it works
        packages.zlib2 = (pkgs.haskellPackages.callCabal2nix "zlib" inputs.zlib-src { }).override { zlib = pkgs.zlib; };
        # it works
        packages.splitmix1 = (pkgs.haskellPackages.splitmix).override { testu01 = null; };
        # it doesn't work
        packages.splitmix2 = (pkgs.haskellPackages.callCabal2nix "splitmix" inputs.splitmix-src { }).override { testu01 = null; };
      };

Only the last one failed with error: function 'anonymous lambda' called without required argument 'testu01'

15:03:21
@bglgwyng:matrix.orgbglgwyng I can see testu01 in the arguments of cabal2nix-splitmix, but somehow the override failed. 15:04:08
@keypusher:matrix.orgkeypusherI have a hard time getting protoc (on the PATH) while building a package with callCabal2Nix. It's used by cabal extension.15:20:20
@keypusher:matrix.orgkeypusherAre there any tricks to troubleshooting that?15:21:06
@sternenseemann:systemli.orgsterni (he/him) keypusher: cabal2nix does not really have the ability to do that automatically since Cabal does not allow specifying a dependency on a build tool that is not itself a Cabal package. You need to use addBuildTools or the like from haskell.lib.compose. 15:32:07
@sternenseemann:systemli.orgsterni (he/him) bglgwyng: on what system does packages.splitmix2 fail to evaluate? 15:36:34
@keypusher:matrix.orgkeypusherOh ok. I tried googling "haskell.lib.compose addBuildtools" but came up a bit short. You don't happen to have some useful url?15:37:31
@keypusher:matrix.orgkeypusherthanks btw!15:37:53
@sternenseemann:systemli.orgsterni (he/him) bglgwyng: the testu01 test suite is only buildable on linux, Cabal discards this dependency on non-linux, you can force the platform to use with e.g. --system x86_64-linux 15:38:40
@sternenseemann:systemli.orgsterni (he/him) keypusher: https://nixos.org/manual/nixpkgs/stable/#haskell-trivial-helpers 15:39:11
@bglgwyng:matrix.orgbglgwyngit's x86_64-linux15:52:22
@bglgwyng:matrix.orgbglgwyngI haven't trie don the other platforms15:53:24
@sternenseemann:systemli.orgsterni (he/him)

cabal2nix --system x86_64-linux https://hackage.haskell.org/package/splitmix-0.1.3.1.tar.gz gives me

{ mkDerivation, async, base, base-compat-batteries, bytestring
, containers, criterion, deepseq, fetchzip, HUnit, lib
, math-functions, process, random, template-haskell, test-framework
, test-framework-hunit, testu01, tf-random, vector
}:
mkDerivation {
  pname = "splitmix";
  version = "0.1.3.1";
  src = fetchzip {
    url = "https://hackage.haskell.org/package/splitmix-0.1.3.1.tar.gz";
    sha256 = "0mll5axdvh5wan6prh3v6l2n15xsj31ghi0g887ljpk515id5a2w";
  };
  libraryHaskellDepends = [ base deepseq ];
  testHaskellDepends = [
    async base base-compat-batteries bytestring containers deepseq
    HUnit math-functions process random template-haskell test-framework
    test-framework-hunit tf-random vector
  ];
  testSystemDepends = [ testu01 ];
  benchmarkHaskellDepends = [
    base containers criterion random tf-random
  ];
  description = "Fast Splittable PRNG";
  license = lib.licenses.bsd3;
}

So this looks fine.

15:54:59

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