| 7 Jan 2026 |
 maralorn | Acid Bong: The problem is that the packages field in shellFor is not for listing dependencies but for listing the packages you want to be able to build within your shell. | 18:40:11 |
 Acid Bong | ah, so a regular mkShell with ghc.withPackages in it is enough? | 20:28:08 |
| maralorn | That would probably work, yes. | 20:29:20 |
| Acid Bong | bloo-dy-hell, that was so easy 🤦♂️ looks like the shellFor docs are misleading | 20:33:57 |
| maralorn | There are many ways to hold this. Surprisingly many of them work but still most don’t. 😄 | 20:37:03 |
| 8 Jan 2026 |
| Acid Bong | i wanna file a ticket about ghc.withPackages ignoring installDocumentation = false, but(1) there already exists one, but(2) the author mistook it for a NixOS issue (it's 316768). should we reformat the issue or open a new one? | 20:12:50 |
| 9 Jan 2026 |
 sterni (he/him) | It got broken by a recent emscripten update again, just needs someone to look at config.log for ghc and see what goes wrong | 15:27:25 |
| sterni (he/him) | This will be addressed by https://github.com/NixOS/cabal2nix/pull/667. In theory we could also expand the manual exclude list in the meantime, but I think it's not really urgent at this point anymore. | 15:28:56 |
 ners | I'd love to help, but don't know how. | 15:29:18 |
| sterni (he/him) | ners: it would already be helpful if you could open an issue for the problem and obtain the contents of config.log (written by autoconf). You can get that by building witih --keep-failed. | 15:31:18 |
| sterni (he/him) | also link this piece of information, please: https://github.com/NixOS/nixpkgs/pull/466258#issuecomment-3651073416 | 15:32:43 |
 Artem | i'm trying to build simple liquidhaskell app (https://github.com/ulysses4ever/liquid-haskell-demo) with
# default.nix
(pkgs.haskellPackages.callCabal2nix "liquid-haskell-app" ./liquid-haskell-app {}).overrideAttrs (old: {
nativeBuildInputs = (old.nativeBuildInputs or []) ++ [ pkgs.z3 ];
})
when I run nix-build I see that the builder runs haddock, which conflicts with liquid haskell (). I tried adding doHaddock = false; in the overrideAttrs but that didn't change a thing. What am I missing to turn off Haddock?
| 18:35:48 |
| sterni (he/him) | you need to use the override interface of the haskell builder, not overrideAttrs | 18:36:22 |
| sterni (he/him) | i.e. haskell.lib.compose.overrideCabal | 18:36:28 |
 andromeda | In reply to @sternenseemann:systemli.org
ners: it would already be helpful if you could open an issue for the problem and obtain the contents of config.log (written by autoconf). You can get that by building witih --keep-failed. most helpful thing I learned today: --keep-failed exists | 19:02:01 |
| Artem | sterni: i tried
pkgs.haskell.lib.overrideCabal (pkgs.haskellPackages.callCabal2nix "liquid-haskell-app" ./liquid-haskell-app {}) (old: {
nativeBuildInputs = (old.nativeBuildInputs or []) ++ [ pkgs.z3 ];
doHaddock = false;
})
but that fails with a type error:
error: function 'anonymous lambda' called with unexpected argument 'nativeBuildInputs'
| 19:06:06 |
| sterni (he/him) | That’s expected the dependency declarations are named different there to match cabal | 19:06:47 |
| sterni (he/him) | you can look it up in the nixpkgs manual under “specifying dependencies” in the haskell section | 19:07:13 |
| Artem | great, "buildTools" worked. Thanks a lot! | 19:16:47 |
| andromeda | liquid haskell looks really cool | 19:48:59 |
| Artem | apparently, core liquid packages in nixpkgs are built without liquid annotations for the same reason: Haddock was enabled by default. So, now I need to disable it there. haskell-modules/configuration-nix.nix seems like the right place? And it should look fairly similar (oveerideCabal) I guess. | 20:46:49 |
| 10 Jan 2026 |
|  pnotequalnp joined the room. | 05:15:41 |
|  Jean 💕 joined the room. | 11:28:04 |
 tks_123 | mates | 13:02:04 |
| tks_123 | Is there a way to add a haskell package as a flake (i.e. some other haskell project with its own flake.nix) into the haskellPackages of my own haskell project? | 13:03:37 |
| tks_123 | are there examples of this out there? | 13:03:45 |
| Acid Bong | In reply to @tks_123:matrix.org
Is there a way to add a haskell package as a flake (i.e. some other haskell project with its own flake.nix) into the haskellPackages of my own haskell project? yup, but i hope they expose a package.nix with the package recipe alone, so you could haskellPackages.callPackage it | 13:25:26 |
| Acid Bong | (for the sake of using the same version and edition of GHC) | 13:26:01 |
| maralorn | Its complicated, the default flake interface is not really meant to be composable. | 16:03:30 |
| maralorn | Some flake authors design their flake in a way that they expose a) the package and b) an overlay which injects the package. | 16:04:05 |
