In reply to @maralorn:maralorn.de
lxsameer: Nice. I personally wouldn’t send this through a formatter, I think those newlines are just noise. But that does not seem important.

You need to generate something like:

            description = "Compression and decompression in the gzip and zlib formats";
            license = lib.licenses.bsd3;
          })
        { zlib = pkgs.zlib; };

In reply to @maralorn:maralorn.de
To drive that point home: When callPackage sees "zlib" it will first look for a package called zlib in final and only if it doesn’t find one it will fallback to zlib from pkgs. So the Haskell lib shadows the system lib on lookup. I really encourage you to look at the hackage-packages.nix file in nixpkgs because you are basically recreating what it does. There you can see how system libraries often get manual overrides.

In reply to @lxsameer:matrix.org
i think at the end of the day we need to maintain a list of packages that need special care

In reply to @lxsameer:matrix.org
for example, as sterni suggested I'm using ghc-pkg list to ignore some packages like rts but that cause some issues with other packages like primitive

In reply to @sternenseemann:systemli.org
what is the issue with primitive?

since it is in the ghc-pkgs list I didn't generate an override for it. But cabal throws the following error message:

       > Running phase: updateAutotoolsGnuConfigScriptsPhase
       > Running phase: configurePhase
       > configureFlags: --verbose --prefix=/nix/store/g58fsvxjn69yls3bswyqwh3p6sylvcz8-integer-conversion-0.1.1 --libdir=$prefix/lib/$compiler/lib --libsubdir=$abi/$libname --docdir=/nix/store/dlfskyys6c0bczndvh2
hmvmmznw8s9gf-integer-conversion-0.1.1-doc/share/doc/integer-conversion-0.1.1 --with-gcc=gcc --package-db=/build/tmp.ILQq7Ci7Lr/package.conf.d --ghc-option=-j16 --ghc-option=+RTS --ghc-option=-A64M --ghc-option=-R
TS --disable-library-profiling --disable-profiling --enable-shared --disable-coverage --enable-static --disable-executable-dynamic --disable-tests --disable-benchmarks --enable-library-vanilla --disable-library-fo
r-ghci --enable-split-sections --enable-library-stripping --enable-executable-stripping --ghc-option=-haddock --extra-lib-dirs=/nix/store/53iigsmf32bwkfdhhihq2rppgk23k2rg-ncurses-6.4.20221231/lib --extra-lib-dirs=
/nix/store/pmf31rbzvv618qirwmzppjb63wsrl4zi-libffi-3.4.6/lib --extra-lib-dirs=/nix/store/yljlqz62v8a9brqmvib9pa4k7yanb15a-elfutils-0.191/lib --extra-lib-dirs=/nix/store/y54504sbwlbbm14hkvv48yw4smjw649c-gmp-with-cx
x-6.3.0/lib
       > Using Parsec parser
       > Configuring integer-conversion-0.1.1...
       > CallStack (from HasCallStack):
       >   withMetadata, called at libraries/Cabal/Cabal/src/Distribution/Simple/Utils.hs:368:14 in Cabal-3.10.3.0:Distribution.Simple.Utils
       > Error: Setup: Encountered missing or private dependencies:
       > primitive >=0.9.0.0 && <0.10
       >
       For full logs, run 'nix log /nix/store/rgp0ww32si0r2lr6kzj18qc4c5yhb8aa-integer-conversion-0.1.1.drv'.

In reply to @sternenseemann:systemli.org
also, as I sad you of course have to check that the version also matches

In reply to @sternenseemann:systemli.org
you should use an unwrapped ghc obviously