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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/144 Servers

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1 Feb 2026
@hellwolf:matrix.orghellwolf

Checking stuff that I use in haskell-updates now...

First one:

NIXPKGS_ALLOW_BROKEN=1 nix build .#haskellPackages.lhs2tex --impure

, built for me, but it's marked broken in

pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml:  - lhs2tex # failure in job https://hydra.nixos.org/build/307520007 at 2025-09-19
18:06:04
@hellwolf:matrix.orghellwolfis pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml automatically generated?18:06:18
@alexfmpe:matrix.orgalexfmpeautomatically but not constantly IIRC18:31:37
@alexfmpe:matrix.orgalexfmpeprobably re-generated before merging a LTS bump PR or something18:31:57
@alexfmpe:matrix.orgalexfmpeor at least newly broken builds are thrown in there18:32:26
@alexfmpe:matrix.orgalexfmpe* or at least newly broken builds are thrown in there automatically at some point in the branching lifecycle18:32:41
@alexfmpe:matrix.orgalexfmpethe fix in your case is removing lhs2tex from broken.yaml18:32:59
@alexfmpe:matrix.orgalexfmpeit won't get back inside unless it gets broken again18:33:31
@alexfmpe:matrix.orgalexfmpe* it won't automatically get back inside unless it gets broken again18:33:40
@alexfmpe:matrix.orgalexfmpehttps://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/HACKING.md#mark-broken-packages18:34:35
@hellwolf:matrix.orghellwolfin fairness, I just realized that it's broken in "master"18:41:24
@hellwolf:matrix.orghellwolfI guess this haskell-updates branch will have it fied.18:41:32
@hellwolf:matrix.orghellwolf* I guess this haskell-updates branch will have it fixed.18:41:36
@hellwolf:matrix.orghellwolf* in fairness, I just confirmed that it is still broken in "master"18:41:51
@maralorn:maralorn.demaralornOnly if someone manually did that.18:59:39
@hellwolf:matrix.orghellwolffor self-documenting purpose, would it make sense to leave a line on top instructing how to do that?19:00:23
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