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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 infrastructure134 Servers

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14 Nov 2025
@not-jack:matrix.orgnot-jacklooked online and saw some non nix-y solutions but was wondering if there is a simple fix09:55:23
@sternenseemann:systemli.orgsterniwell you need to make libGL available is what the error tells you. How to do that depends on what exactly you're doing and what you're using which isn't totally clear from what you've stated.10:14:19
@maralorn:maralorn.demaralornbtw. what’s the state of our branch?10:18:11
@maralorn:maralorn.demaralornWow, hls broken again??10:20:23
@maralorn:maralorn.demaralornHuh, maybe it wasn’t fixed on staging-next and we didn’t notice.10:21:00
@maralorn:maralorn.demaralornThat would be more plausible.10:21:08
@not-jack:matrix.orgnot-jackoops, fixed it 12:12:25
@sternenseemann:systemli.orgsterni
> time git push origin HEAD:refs/heads/haskell-updates
…
real	5m4.842s

interesting

21:37:51
@leona:leona.isleonagithub currently really struggles with NIxpkgs' size21:42:18
@sternenseemann:systemli.orgsterniI think pretty okay, but you'll know more after https://hydra.nixos.org/eval/182019521:47:06
17 Nov 2025
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18 Nov 2025
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19 Nov 2025
@alex:tunstall.xyzAlex Would any of the haskellPackages maintainers be interested in reviewing/merging this PR to add microhs package sets?
https://github.com/NixOS/nixpkgs/pull/460845
09:34:20
20 Nov 2025
@user12592851:matrix.orgJohn joined the room.04:57:16
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@magic_rb:matrix.redalder.orgmagic_rbanyone have any pointers for the cross compiling GHC itself issue? i would like to get some kind of GHC for armv6l if at all possible (would also help the riscv people)20:43:05
@alex:tunstall.xyzAlex
In reply to @magic_rb:matrix.redalder.org
anyone have any pointers for the cross compiling GHC itself issue? i would like to get some kind of GHC for armv6l if at all possible (would also help the riscv people)
Start from 9.4.
20:48:04
@alex:tunstall.xyzAlex9.4 can be done cross, >= 9.6 doesn't work (unless upstream fixed it?)20:48:28
@alex:tunstall.xyzAlex
In reply to @magic_rb:matrix.redalder.org
anyone have any pointers for the cross compiling GHC itself issue? i would like to get some kind of GHC for armv6l if at all possible (would also help the riscv people)

This repository builds GHC for RISC-V from an older commit of nixpkgs, but it should demonstrate how to do it.

https://github.com/AlexandreTunstall/nixos-riscv

20:49:57
@alex:tunstall.xyzAlex In particular, see modules/compilers/ghc.nix 20:50:40
@magic_rb:matrix.redalder.orgmagic_rbgoddamn armv6l-linux isnt even in the default cross set20:52:18
@magic_rb:matrix.redalder.orgmagic_rbthis will almost certainly go horribly, i doubt ghc even support armv6 officially20:54:53
@alex:tunstall.xyzAlexIt's possible that they used to but eventually dropped support for it.21:04:42
@magic_rb:matrix.redalder.orgmagic_rbIm currently building llvm, we'll see how much ghc explodes21:06:02
@magic_rb:matrix.redalder.orgmagic_rbArmv6 is ancient and i dont blame anyone for dropping it21:06:13
@alex:tunstall.xyzAlexOh, I might be confusing it with armv7l21:06:33
@magic_rb:matrix.redalder.orgmagic_rbArmv7l is old but less ancient21:06:45
@magic_rb:matrix.redalder.orgmagic_rbArmv7l actually is still supported by some stuff21:06:58

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