How is the syntax to override a haskellPackage? I want to overlay/override haskellPackages.ncurses from inputs.nixpkgs to the one from inputs.nixpkgs-haskellpackages-ncurses. This is what I got so far.

  overlay = overlayFinal: overlayPrev: {
    ncurses =
      inputs.nixpkgs-haskellpackages-ncurses.legacyPackages.${system}.haskellPackages.ncurses;
  };

maralorn: I have my flake.nix which uses haskell-template for a Haskel/Cabal project.

In my helda.cabal, I have ncurses as a dependency

  build-depends:
    , ncurses

The problem is that haskellPackages.ncurses is marked as broken

rg -A12 '"ncurses"' pkgs/development/haskell-modules/hackage-packages.nix
216136:  "ncurses" = callPackage
216137-    ({ mkDerivation, base, c2hs, containers, ncurses, text
216138-     , transformers
216139-     }:
216140-     mkDerivation {
216141:       pname = "ncurses";
216142-       version = "0.2.16";
216143-       sha256 = "0gsyyaqyh5r9zc0rhwpj5spyd6i4w2vj61h4nihgmmh0yyqvf3z5";
216144-       revision = "1";
216145-       editedCabalFile = "1wfdy716s5p1sqp2gsg43x8wch2dxg0vmbbndlb2h3d8c9jzxnca";
216146-       libraryHaskellDepends = [ base containers text transformers ];
216147-       librarySystemDepends = [ ncurses ];
216148-       libraryToolDepends = [ c2hs ];
216149-       description = "Modernised bindings to GNU ncurses";
216150-       license = lib.licenses.gpl3Only;
216151-       hydraPlatforms = lib.platforms.none;
216152-       broken = true;
216153-     }) {inherit (pkgs) ncurses;};

The latest successful build is from 49d15c3e29a870d1b6121f7310a747783ddd961f.

hydra-check haskellPackages.ncurses
Build Status for nixpkgs.haskellPackages.ncurses.x86_64-linux on unstable
✔ ncurses-0.2.16 from 2021-12-25 - https://hydra.nixos.org/build/162301952

So I was trying to workaround this by overlaying haskellPackages.ncurses with the one from 49d15c3e29a870d1b6121f7310a747783ddd961f.

@starlit: I see. Well I'd recommend you just override ncurses with unmarkBroken and see if it works.

An example overlay for haskellPackages:

haskellPackages.override { overrides = self: super: { ncurses = pkgs.haskell.lib.doJailbreak super. ncurses; }; }

An example overlay for haskellPackages:

haskellPackages.override { overrides = self: super: { ncurses = pkgs.haskell.lib.unmarkBroken super. ncurses; }; }

In reply to @maralorn:maralorn.de

@starlit: I see. Well I'd recommend you just override ncurses with unmarkBroken and see if it works.

@nix { "action": "setPhase", "phase": "setupCompilerEnvironmentPhase" }
Running phase: setupCompilerEnvironmentPhase
Build with /nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5.
@nix { "action": "setPhase", "phase": "unpackPhase" }
Running phase: unpackPhase
unpacking source archive /nix/store/kav9yjn2q7l9zdxk96z5ymcy0w48l4vj-ncurses-0.2.16.tar.gz
source root is ncurses-0.2.16
setting SOURCE_DATE_EPOCH to timestamp 1472432977 of file ncurses-0.2.16/Setup.hs
@nix { "action": "setPhase", "phase": "patchPhase" }
Running phase: patchPhase
Replace Cabal file with edited version from mirror://hackage/ncurses-0.2.16/revision/1.cabal.
@nix { "action": "setPhase", "phase": "compileBuildDriverPhase" }
Running phase: compileBuildDriverPhase
setupCompileFlags: -package-db=/build/tmp.D8cye0V4Fj/setup-package.conf.d -threaded
[1 of 2] Compiling Main             ( Setup.hs, /build/tmp.D8cye0V4Fj/Main.o )
[2 of 2] Linking Setup
@nix { "action": "setPhase", "phase": "updateAutotoolsGnuConfigScriptsPhase" }
Running phase: updateAutotoolsGnuConfigScriptsPhase
@nix { "action": "setPhase", "phase": "configurePhase" }
Running phase: configurePhase
configureFlags: --verbose --prefix=/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16 --libdir=$prefix/lib/$compiler/lib --libsubdir=$abi/$libname --docdir=/nix/store/llr08kp2w5s4qc21zvx9zz5jw9ys42xz-ncurses-0.2.16-doc/share/doc/ncurses-0.2.16 --with-gcc=gcc --package-db=/build/tmp.D8cye0V4Fj/package.conf.d --ghc-option=-j4 --ghc-option=+RTS --ghc-option=-A64M --ghc-option=-RTS --enable-library-profiling --profiling-detail=exported-functions --disable-profiling --enable-shared --disable-coverage --enable-static --disable-executable-dynamic --enable-tests --disable-benchmarks --enable-library-vanilla --disable-library-for-ghci --enable-split-sections --enable-library-stripping --enable-executable-stripping --ghc-option=-haddock --extra-lib-dirs=/nix/store/qi2525fzsnmgayxba5gxc2xi3x80g99x-ncurses-6.4.20221231/lib --extra-lib-dirs=/nix/store/nj9g42fdsm8l2z43kfcahch3px2q209a-libffi-3.4.6/lib --extra-lib-dirs=/nix/store/3bffbi88dmkpr5ib58wsngqd6bfdjzgj-elfutils-0.191/lib --extra-lib-dirs=/nix/store/vgzmgmppvpb6gqlc56jhcn007cjn7xg9-gmp-with-cxx-6.3.0/lib --extra-include-dirs=/nix/store/wdpbay39lcqhc7yp1472f33lgjiai7x0-ncurses-6.4.20221231-dev/include --extra-lib-dirs=/nix/store/wdpbay39lcqhc7yp1472f33lgjiai7x0-ncurses-6.4.20221231-dev/lib --extra-lib-dirs=/nix/store/qi2525fzsnmgayxba5gxc2xi3x80g99x-ncurses-6.4.20221231/lib
Using Parsec parser
Warning: ncurses.cabal:85:21: version operators used. To use version operators
the package needs to specify at least 'cabal-version: >= 1.8'.
Configuring ncurses-0.2.16...
Flags chosen: force-narrow-library=False, use-pkgconfig=False
Dependency base >=4.6 && <5.0: using base-4.18.2.1
Dependency containers >=0.2: using containers-0.6.7
Dependency text >=0.7: using text-2.0.2
Dependency transformers >=0.2: using transformers-0.6.1.0
Source component graph: component lib
Configured component graph:
    component ncurses-0.2.16-9arnZ0bDMmPEMvgPKnlSMs
        include base-4.18.2.1
        include containers-0.6.7
        include text-2.0.2
        include transformers-0.6.1.0
Linked component graph:
    unit ncurses-0.2.16-9arnZ0bDMmPEMvgPKnlSMs
        include base-4.18.2.1
        include containers-0.6.7
        include text-2.0.2
        include transformers-0.6.1.0
        UI.NCurses=ncurses-0.2.16-9arnZ0bDMmPEMvgPKnlSMs:UI.NCurses,UI.NCurses.Panel=ncurses-0.2.16-9arnZ0bDMmPEMvgPKnlSMs:UI.NCurses.Panel
Ready component graph:
    definite ncurses-0.2.16-9arnZ0bDMmPEMvgPKnlSMs
        depends base-4.18.2.1
        depends containers-0.6.7
        depends text-2.0.2
        depends transformers-0.6.1.0
Using Cabal-3.10.3.0 compiled by ghc-9.6
Using compiler: ghc-9.6.5
Using install prefix:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16
Executables installed in:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16/bin
Libraries installed in:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16/lib/ghc-9.6.5/lib/x86_64-linux-ghc-9.6.5/ncurses-0.2.16-9arnZ0bDMmPEMvgPKnlSMs
Dynamic Libraries installed in:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16/lib/ghc-9.6.5/lib/x86_64-linux-ghc-9.6.5
Private executables installed in:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16/libexec/x86_64-linux-ghc-9.6.5/ncurses-0.2.16
Data files installed in:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16/share/x86_64-linux-ghc-9.6.5/ncurses-0.2.16
Documentation installed in:
/nix/store/llr08kp2w5s4qc21zvx9zz5jw9ys42xz-ncurses-0.2.16-doc/share/doc/ncurses-0.2.16
Configuration files installed in:
/nix/store/5ygqahwg0a9yz44721m3j6fa0i2lfff9-ncurses-0.2.16/etc
No alex found
Using ar found on system at:
/nix/store/wwfrj9kvfi14xclc38qfwm71ah6aawdh-binutils-2.41/bin/ar
Using c2hs version 0.28.8 found on system at:
/nix/store/n5khviada8v23vvfyldlk6dvd7fp1hzw-c2hs-0.28.8/bin/c2hs
No cpphs found
No doctest found
Using gcc version 13.3.0 given by user at:
/nix/store/mpm3i0sbqc9svfch6a17179fs64dz2kv-gcc-wrapper-13.3.0/bin/gcc
Using ghc version 9.6.5 found on system at:
/nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5/bin/ghc
Using ghc-pkg version 9.6.5 found on system at:
/nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5/bin/ghc-pkg-9.6.5
No ghcjs found
No ghcjs-pkg found
No greencard found
Using haddock version 2.29.2 found on system at:
/nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5/bin/haddock-ghc-9.6.5
No happy found
Using haskell-suite found on system at: haskell-suite-dummy-location
Using haskell-suite-pkg found on system at: haskell-suite-pkg-dummy-location
No hmake found
Using hpc version 0.68 found on system at:
/nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5/bin/hpc-ghc-9.6.5
Using hsc2hs version 0.68.9 found on system at:
/nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5/bin/hsc2hs-ghc-9.6.5
Using hscolour version 1.25 found on system at:
/nix/store/ipffkmswbacfpi6dl71yxs1llpa0ncw1-hscolour-1.25/bin/HsColour
No jhc found
Using ld found on system at:
/nix/store/l46fjkzva0bhvy9p2r7p4vi68kr7a1db-binutils-wrapper-2.41/bin/ld.gold
No pkg-config found
Using runghc version 9.6.5 found on system at:
/nix/store/sk5if9vmsykj16phb87wv7a8pv08wi62-ghc-9.6.5/bin/runghc-9.6.5
Using strip version 2.41 found on system at:
/nix/store/mpm3i0sbqc9svfch6a17179fs64dz2kv-gcc-wrapper-13.3.0/bin/strip
Using tar found on system at:
/nix/store/95ljdxg4drk1iq8jkjfq2c0z5vbwv8vm-gnutar-1.35/bin/tar
No uhc found
@nix { "action": "setPhase", "phase": "buildPhase" }
Running phase: buildPhase
Preprocessing library for ncurses-0.2.16..
c2hs: C header contains errors:

dist/build/UI/NCurses/Enums.chs.h:140: (column 25) [ERROR]  >>> Unknown identifier!
  Cannot find a definition for `KEY_EVENT' in the header file.

dist/build/UI/NCurses/Enums.chs.h:140: (column 25) [ERROR]  >>> Unknown identifier!
  Cannot find a definition for `KEY_EVENT' in the header file.

This file ncurses-0.2.16/src/lib/UI/NCurses/Enums.chs

In reply to @alexfmpe:matrix.org
is there a way to eval all of haskellPackages?