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	Haskell in Nixpkgs/NixOS	748 Members
	For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs \| Current Docs: https://haskell4nix.readthedocs.io/ \| More Nix: #community:nixos.org \| More Haskell: #haskell-space:matrix.org	149 Servers

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Sender	Message	Time
1 May 2026
alexfmpe	* https://nixos.org/manual/nixpkgs/stable/#sec-pkgs-mkShell-attributes	15:07:56
alexfmpe	try `inputsFrom`	15:08:04
VegOwOtenks	Thanks! I will try inputsFrom, I don't have any clue about the differences.	15:12:54
alexfmpe	my link should explain it	15:15:50
alexfmpe	* my link above explains them	15:15:59
alexfmpe	you probably want the same for libllvm and libclang	15:17:55
alexfmpe	can we improve the whole `security_tool` issue for mac builds? https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/configuration-darwin.nix is littered with `dontCheck` that, well, makes us not run tests `substituteInPlace System/X509/MacOS.hs --replace-fail security /usr/bin/security` that breaks sandbox builds I also run into it for some packages on darwin `pkgsStatic` builds somehow due to the iserv-proxy thing statistics> [33 of 51] Compiling Statistics.Types ( Statistics/Types.hs, dist/build/Statistics/Types.o ) statistics> iserv-proxy: Uncaught exception ghc-internal:GHC.Internal.IO.Exception.IOException: statistics> statistics> /homeless-shelter/Library/Frameworks/Security.framework/Security: withBinaryFile: does not exist (No such file or directory) statistics> statistics> HasCallStack backtrace: statistics> ioError, called at libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs:291:5 in ghc-internal:GHC.Internal.Foreign.C.Error statistics> statistics> <no location info>: error: External interpreter terminated (1)	16:45:24
alexfmpe	* can we improve the whole `security_tool` issue for mac builds? https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/configuration-darwin.nix is littered with `dontCheck` that, well, makes us not run tests `substituteInPlace System/X509/MacOS.hs --replace-fail security /usr/bin/security` that breaks sandbox builds I also run into it for some packages on darwin `pkgsStatic.haskellPackages` builds somehow via iserv-proxy statistics> [33 of 51] Compiling Statistics.Types ( Statistics/Types.hs, dist/build/Statistics/Types.o ) statistics> iserv-proxy: Uncaught exception ghc-internal:GHC.Internal.IO.Exception.IOException: statistics> statistics> /homeless-shelter/Library/Frameworks/Security.framework/Security: withBinaryFile: does not exist (No such file or directory) statistics> statistics> HasCallStack backtrace: statistics> ioError, called at libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs:291:5 in ghc-internal:GHC.Internal.Foreign.C.Error statistics> statistics> <no location info>: error: External interpreter terminated (1)	16:45:47
alexfmpe	huh, wait, maybe that's not the same "security" ? hard to tell with case insensitive system	16:47:08
2 May 2026
sterni (he/him)	In reply to @alexfmpe:matrix.org can we improve the whole `security_tool` issue for mac builds? https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/configuration-darwin.nix is littered with `dontCheck` that, well, makes us not run tests `substituteInPlace System/X509/MacOS.hs --replace-fail security /usr/bin/security` that breaks sandbox builds I also run into it for some packages on darwin `pkgsStatic` builds somehow due to the iserv-proxy thing statistics> [33 of 51] Compiling Statistics.Types ( Statistics/Types.hs, dist/build/Statistics/Types.o ) statistics> iserv-proxy: Uncaught exception ghc-internal:GHC.Internal.IO.Exception.IOException: statistics> statistics> /homeless-shelter/Library/Frameworks/Security.framework/Security: withBinaryFile: does not exist (No such file or directory) statistics> statistics> HasCallStack backtrace: statistics> ioError, called at libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs:291:5 in ghc-internal:GHC.Internal.Foreign.C.Error statistics> statistics> <no location info>: error: External interpreter terminated (1) that looks like the internal linker trying to load the Security framework, but I don’t think that’s available as a static archive, so won’t work at all in pkgsStatic?!	07:30:00
tks_123	Hi all	16:39:50
tks_123	Redacted or Malformed Event	16:40:28
tks_123	I have this flake.nix: https://pastebox.io/api/paste/3WT3DwMK6KZz	16:41:56
tks_123	After doing "nix develop" from top-level dir (same dir as flake.nix dir), I can successfully "cd" into each of the subdirectories, to run "cabal build" on those two individual Haskell projects.	16:42:58
tks_123	* After doing "nix develop" from top-level dir (same dir as flake.nix dir), I can - if the second project doesn't try to depend on the first project - successfully "cd" into each of the subdirectories, to run "cabal build" on those two individual Haskell projects.	16:43:36
tks_123	However, if I add "my-haskell-library" (the first project) into the build-depends of the second project, doing "cabal build" on the second project fails, complaining that "my-haskell-library" is not found.	16:44:27
tks_123	What am I doing wrong?	16:44:29
tks_123	* However, if I add "my-haskell-library" (the first project) into the build-depends of the second project ("my-haskell-executable"), doing "cabal build" on the second project ("my-haskell-executable") fails, complaining that "my-haskell-library" is not found.	16:45:03
tks_123	Hmm after putting this into `cabal.project` of the second project `packages: . ../my-haskell-library` everything seems to work.	16:55:44
tks_123	Why?	16:55:49
tks_123	I thought... the haskellPkgs in Nix was supposed to tell cabal about all known Haskell packages?	16:56:16
tks_123	So why was a cabal.project needed to make this work?	16:56:23
ijouw	I would assume you need two flakes if you want to package them individually, but i am neither very proficient in flakes nor nix so i might be mistaken.	17:54:03
alexfmpe	I think shellFor won't add `packages` to `ghc-pkg list` since you're asking for a shell for iterating on them	19:18:29
alexfmpe	So you need cabal.project to tell cabal about the other project	19:18:56
alexfmpe	You could also just have the library and the executable in the same package and not worry about this	19:19:35
3 May 2026
maralorn	Also if nix would compile your library and provide it to the other package it would be that snapshot and not live.	07:17:57
tks_123	Great insights, thank you	07:18:57
tks_123	So technically `cabal.project` is "orthogonal" (unrelated, separate) concept entirely from what packages haskellPkgs will end up available for Haskell?	07:20:07
tks_123	I'm not sure where I got the idea those were somehow related	07:20:28

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