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{ stdenv, haskellPackages, cabal-install }:
haskellPackages.shellFor {
packages = p: [ p.database-id-class p.constraints-extras ];
nativeBuildInputs = [ cabal-install ];
phases = [ "unpackPhase" "buildPhase" "installPhase" ];
unpackPhase = ''
sourceRoot=$(pwd)/scratch
mkdir -p "$sourceRoot"
cd "$sourceRoot"
tar -xf ${haskellPackages.database-id-class.src}
tar -xf ${haskellPackages.constraints-extras.src}
cp ${builtins.toFile "cabal.project" "packages: database-id-class* constraints-extras*"} cabal.project
'';
buildPhase = ''
export HOME=$(mktemp -d)
mkdir -p $HOME/.cabal
touch $HOME/.cabal/config
cabal v2-build --offline --verbose database-id-class constraints-extras --ghc-options="-O0 -j$NIX_BUILD_CORES"
'';
installPhase = ''
touch $out
'';
}
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