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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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13 Feb 2026
@b:chreekat.netchreekatwoo, the ginormous IFD fetch of all sources finally finished, it's compling shit now15:37:12
@me:linj.techlinjI am also interested in dyn drv. Could you share some learning materials of it?16:06:15
@b:chreekat.netchreekatwell, i don't really know of any. I myself am building this experiment in hopes of learning something about it16:47:19
@b:chreekat.netchreekat confession: i am using claude. But I'm minimizing the blast damage by compartmentalizing the steps and checking carefully all the parts I do understand 16:48:52
@alexfmpe:matrix.orgalexfmpe
In reply to @b:chreekat.net
as a sanity check, if a tool was introduced that created a drv for every source file of every haskell dependency of your haskell package, that would be unreasonable, right? Way too many drvs?
https://github.com/obsidiansystems/sandstone
17:04:11
@me:linj.techlinj tip: there are slides in the slides branch 17:51:34
@perigord:matrix.orgPerigord changed their profile picture.19:11:38
@alex:tunstall.xyzAlex It shouldn't be, but I think this is mostly a question of how efficiently Nix can handle derivations.
I suspect that there is little effort put into making them low overhead, given how little of Nixpkgs creates such small derivations.
19:41:09
@alexfmpe:matrix.orgalexfmpe summon John Ericson 19:49:32
@Ericson2314:matrix.orgJohn Ericsonhi20:18:57
@Ericson2314:matrix.orgJohn Ericsonsee sandstone20:19:17
@Ericson2314:matrix.orgJohn Ericsongit@github.com:obsidiansystems/sandstone.git20:19:36
@sigmanificient:matrix.orgSigmanificientthe summoning ritual worked :D20:19:37
@Ericson2314:matrix.orgJohn Ericson* https://github.com/obsidiansystems/sandstone20:19:52

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