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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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11 Dec 2025
@andromeda:tchncs.deandromedaI'll just not do wayland fn, it's beyond my ability21:31:11
12 Dec 2025
@iopq:matrix.orgiopqyep that's the one06:06:19
@iopq:matrix.orgiopqhttps://github.com/jtt9340/aoc2025/commit/e5fdca266f62c6ac0145f17f1ba60802dfaf1698 is the solution08:42:37
@alexfmpe:matrix.orgalexfmpe been getting this sort of thing lately
WARNING: /nix/store/5sfpjqy5rbipa3mdgiwal8k7zqfq5jxh-ghc-9.6.7/lib/ghc-9.6.7/bin/./ghc-9.6.7 is loading libcrypto in an unsafe way
when building inside a shell like
nix-shell -p cabal-install ghcid haskell-language-server ghc openssl zlib pkg-config
anyone's seen this? (on unstable)
16:37:09
@alexfmpe:matrix.orgalexfmpe * been getting this sort of thing lately
WARNING: /nix/store/5sfpjqy5rbipa3mdgiwal8k7zqfq5jxh-ghc-9.6.7/lib/ghc-9.6.7/bin/./ghc-9.6.7 is loading libcrypto in an unsafe way
when building inside a shell like
nix-shell -p cabal-install ghcid haskell-language-server haskell.packages.ghc96.ghc openssl zlib pkg-config
anyone's seen this? (on unstable)
16:37:40
@alexfmpe:matrix.orgalexfmpe I see this in .cabal
extra-libraries: crypto
16:38:37
@emilazy:matrix.orgemily I bet related to that dlopen change, maybe. 16:39:06
@emilazy:matrix.orgemilysome discussion https://github.com/cl-plus-ssl/cl-plus-ssl/issues/11416:39:17
@emilazy:matrix.orgemilyI assume this is macOS.16:39:20
@alexfmpe:matrix.orgalexfmpeoops yeah aarch64-darwin16:40:51
@alexfmpe:matrix.orgalexfmpem1 specifically16:40:58
@alexfmpe:matrix.orgalexfmpehmm so the issue is likely to be from loading unversioned libcrypto?16:53:02
@emilazy:matrix.orgemilymy guess is that it's something related to https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12264 / https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14290 / blah16:54:06
@emilazy:matrix.orgemily it might still be loading libcrypto wrong (we'd want that to be an absolute path for Nix presumably?) 16:54:20
@emilazy:matrix.orgemilybut I'd guess this stuff is what exposed it16:54:28
@alexfmpe:matrix.orgalexfmpeI'm getting this on ghc 9.6 though16:58:02
@emilazy:matrix.orgemily ah. then I have no idea. git bisect --first-parent? :) 16:58:53
@alexfmpe:matrix.orgalexfmpeI mean, 9.8 too, just meant it seems to predate those merge request16:58:56
@emilazy:matrix.orgemilyright17:00:41
@emilazy:matrix.orgemilyI'm just assuming you didn't use to get this17:00:47
@alexfmpe:matrix.orgalexfmpenot sure, first time I try to build this particular project17:01:09
@alexfmpe:matrix.orgalexfmpehmm hang on17:01:15
@alexfmpe:matrix.orgalexfmpe I think changing this to crypto.3 fixed it 17:01:53
@alexfmpe:matrix.orgalexfmpecan't confirm right now because I did a clean afterwards and now github is dying on me or something17:02:11
@emilazy:matrix.orgemily I feel like it should work with just crypto and we're holding it wrong or something. but maybe not. 17:04:00
@emilazy:matrix.orgemilyhave you tried 25.05, 24.11?17:04:08
@alexfmpe:matrix.orgalexfmpeI'll see if I can get away with this stupid workaround just to complete the task I was aiming for, then circle back to investigate this properly17:10:17
@emilazy:matrix.orgemilyfair enough17:11:27
13 Dec 2025
@mjolnir:nixos.orgNixOS Moderation Bot unbanned @mightyiam:matrix.org@mightyiam:matrix.org.05:59:25
@bodzioney:matrix.orgEthan changed their display name from Ethan Bodzioney to Ethan.22:13:39

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