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  •   moreOverlays = [ (import ./oldnix/overlay.nix) ];
    
    
      # Read in the Niv sources
    
      sources = import ./nix/sources.nix { };
    
      # If ./nix/sources.nix file is not found run:
      #   niv init
      #   niv add input-output-hk/haskell.nix -n haskellNix
    
      # Fetch the haskell.nix commit we have pinned with Niv
    
      haskellNix = import sources.haskellNix { };
    
      # If haskellNix is not found run:
      #   niv add input-output-hk/haskell.nix -n haskellNix
    
    
      allOverlays = moreOverlays ++ haskellNix.nixpkgsArgs.overlays;
    
      # Import nixpkgs and pass the haskell.nix provided nixpkgsArgs
    
      pkgs = import
    
        # haskell.nix provides access to the nixpkgs pins which are used by our CI,
        # hence you will be more likely to get cache hits when using these.
        # But you can also just use your own, e.g. '<nixpkgs>'.
        haskellNix.sources.nixpkgs-2009
        # These arguments passed to nixpkgs, include some patches and also
        # the haskell.nix functionality itself as an overlay.
    
        (haskellNix.nixpkgsArgs // { overlays = allOverlays; });
    
      hsPkgs = pkgs.haskell-nix.project {
        # 'cleanGit' cleans a source directory based on the files known by git
        src = pkgs.haskell-nix.haskellLib.cleanGit {
          name = "PaymentServer";
          src = ./.;
        };
        modules = [{
          packages.PaymentServer.components.library.libs = [
            pkgs.pkg-config
            pkgs.libchallenge_bypass_ristretto_ffi
          ];
        }];
    
    in
      hsPkgs
      # pkgs.lib.recursiveUpdate hsPkgs {
      #   PaymentServer.setup.propagatedNativeBuildInputs = [
      #     pkgs.pkg-config
      #     pkgs.libchallenge_bypass_ristretto_ffi
      #   ];
      #   PaymentServer.components.library.propagatedNativeBuildInputs = [
      #     pkgs.pkg-config
      #     pkgs.libchallenge_bypass_ristretto_ffi
      #   ];
      # }