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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* 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
@alexfmpe:matrix.orgalexfmpe
In reply to @hellwolf:matrix.org
is pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml automatically generated?
Remove it from this file
11:32:00
@alexfmpe:matrix.orgalexfmpeAssuming it builds locally when you use NIXPKGS_ALLOW_BROKEN=1 or haskell.lib.unmarkBroken11:33:37
@hellwolf:matrix.orghellwolfyes, it builds locally. I will check it out how to update the file, or I will just remove it manually.13:01:06
@hellwolf:matrix.orghellwolf* yes, it builds locally. I will check it out to learn how to update the file, or I will just remove it manually.13:01:16
@hellwolf:matrix.orghellwolf* yes, it builds locally. I will learn how to update the file, or I will just remove it manually.13:01:22
@hellwolf:matrix.orghellwolf * yes, it builds locally on the haskell-updates branch. I will learn how to update the file, or I will just remove it manually. 13:01:37
@maralorn:maralorn.demaralornThere is no way to programatically remove a line from that file, that has to happen manually. We only add lines automatically.13:14:04
@hellwolf:matrix.orghellwolfshould I create a PR? since I can't push to haskell-updates.13:18:53
@maralorn:maralorn.demaralornYes, always!13:21:22
@sternenseemann:systemli.orgsterni (he/him)
In reply to @alexfmpe:matrix.org
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 ?
think so
13:27:16
@alexfmpe:matrix.orgalexfmpeI got that change stashed, can PR later today13:28:35
@alexfmpe:matrix.orgalexfmpeTechnically I expect it will also apply to wasm since these are always 'emulated' targets13:29:08
@alexfmpe:matrix.orgalexfmpeBut we'll generalise that bridge when we come to it13:29:39
@alexfmpe:matrix.orgalexfmpe* Technically I expect it should also apply to wasm since these are always 'emulated' targets13:29:51
@alexfmpe:matrix.orgalexfmpe* Technically I expect it should also apply to wasm (if/when we get it) since these are always 'emulated' targets13:30:32
@teoc:matrix.orgTeo (he/him)Is iserv-proxy rather than just plain iserv needed for these? I would've assumed that iserv-proxy isn't very helpful in nix since you can't access the network13:40:52
@sternenseemann:systemli.orgsterni (he/him)we need to execute it independently from ghc anyways since it needs to run under emulation14:52:41
@teoc:matrix.orgTeo (he/him)Sure but isn't that just iserv running under an emulator, does it need to go via a network?14:55:09
20 May 2021
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