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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 infrastructure138 Servers

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26 Apr 2026
@andromeda:tchncs.deandromeda
In reply to @alexfmpe:matrix.org
hackage.nix lets you take cabal.project into account, and also use the solver, but it's an entirely different beast
what makes that an entirely different beast?
14:17:44
@alexfmpe:matrix.orgalexfmpehttps://input-output-hk.github.io/haskell.nix/motivation.html#comparison-with-nixpkgs14:18:25
@alexfmpe:matrix.orgalexfmpethat's somewhat outdated, it's not necessarily better for cross, but the rest stands14:19:00
@andromeda:tchncs.deandromeda that... seems like overkill. I'mma go with keeping the cabal.project in sync enough with the flake. 14:21:01
@sternenseemann:systemli.orgsternicabal-install v2 commands expect build-tool-depends to be registered in the package db which Nix environments don't do because it is wrong from the perspective of the dependency separation: build tools go to nativeBuildInputs and not into (propagated)BuildInputs. Only the latter get folded into the package db. There is an open issue about this. Only affects developer environments. Easiest workaround is to use the cabal-install v1 commands which check PATH for tools as well.14:33:49
@sternenseemann:systemli.orgsterniah alex already answered, nvm.14:34:29
@sternenseemann:systemli.orgsterni aiya: I bumped Hackage two days ago, you can follow the progress there: https://github.com/NixOS/nixpkgs/pull/510883. Giving a timeline is hard, but the answer is weeks unfortunately at the moment. 14:36:14
@aiya:catgirl.cloudaiya sterni i see, so maybe it is worth fixing, could you please elaborate on your latest comment here (https://github.com/NixOS/nixpkgs/pull/506489#discussion_r3110806985)? apologies, i don't fully understand it 20:02:42
27 Apr 2026
@ashinnv:matrix.org👿👿👿M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ 👹👹👹👹😈😈😈 changed their display name from M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ Houston, we've had a Microsoft to M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐.00:11:10
@ashinnv:matrix.org👿👿👿M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ 👹👹👹👹😈😈😈 changed their display name from M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ to 👿👿👿M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ 👹👹👹👹😈😈😈.00:12:37
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