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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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29 Jan 2026
@ashinnv:matrix.orgm changed their display name from GOD EMPEROR MAYHEM - OVERSEER OF ENTROPY AND THE SECOND LAW to m.18:47:46
30 Jan 2026
@juhp:matrix.orgJens Petersen joined the room.10:17:18
@sternenseemann:systemli.orgsterni Alex: https://hydra.nixos.org/build/320163473 13:59:22
@alex:tunstall.xyzAlexI will take a look tonight.14:51:23
31 Jan 2026
@sternenseemann:systemli.orgsterni alexfmpe: https://hydra.nixos.org/build/320785285 12:03:02
@alexfmpe:matrix.orgalexfmpeoooh they finally did a new release after almost 2 years19:27:27
@alexfmpe:matrix.orgalexfmpehttps://github.com/NixOS/nixpkgs/pull/48570619:27:28
@alexfmpe:matrix.orgalexfmpe I've noticed iserv-proxy is getting built for ghcjs even though it's not actually used
is it worth adding a && !isGhcjs to the "should we proxy TH" to save builds of network->iserv-wrapper ?
19:31:21
@alexfmpe:matrix.orgalexfmpe * I've noticed iserv-proxy is getting built for ghcjs even though it's not actually used
is it worth adding a && !isGhcjs to the "should we proxy TH" to save builds of network->iserv-proxy ?
21:17:28
@nathan0x28a:matrix.orgnathan0x28A joined the room.23:31:59
1 Feb 2026
@sigmasquadron:matrix.orgFernando Rodrigues changed their display name from SigmaSquadron to Fernando Rodrigues.10:41:50
@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
@alexfmpe:matrix.orgalexfmpewell, it can be fixed by a hackage bump what only happens manually is taking off the 'broken' status19:03:31
@hellwolf:matrix.orghellwolfFixed a package against the next haskell-updates: https://github.com/NixOS/nixpkgs/pull/48600919:39:54
2 Feb 2026
@nathan0x28a:matrix.orgnathan0x28AHow would I go about manually taking off the 'broken' status?09:28:36

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