{ lib
, sources ? import ../nix/sources.nix
, ...
}:
(self: super: {
  haskell = super.haskell // {
    packageOverrides = self: super: {
      achat = (self.callCabal2nix "achat" ../. { }).overrideAttrs (_: {
        postInstall = ''
          mkdir -p $out/share
          cp -a ./dist/build/achat/achat.jsexe $out/share
        '';
      });
      haskell-halogen-core = lib.dontCheck (self.callCabal2nix "haskell-halogen-core" sources.haskell-halogen { });
      protolude = lib.dontHaddock (
        lib.appendConfigureFlags (lib.doJailbreak super.protolude) [
          "--ghc-option=-fno-safe-haskell"
          "--ghc-option=-fno-warn-x-partial"
        ]);
      clay = self.callHackage "clay" "0.15.0" { };
    };
  };
})