{
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";

  outputs = {
    self,
    nixpkgs,
  }: let
    system = "aarch64-darwin";
    pkgs = nixpkgs.legacyPackages.${system};
  in {
    packages.${system}.default = pkgs.stdenv.mkDerivation {
      name = "image_processor";
      src = ./.;

      # Add pkg-config here so CMake can find it during the build
      nativeBuildInputs = [
        pkgs.cmake
        pkgs.pkg-config
      ];

      buildInputs = [pkgs.libjpeg_turbo];

      # Nix's default CMake phase will run, but we need to ensure
      # the library actually gets installed to the nix store output
      installPhase = ''
        mkdir -p $out/lib $out/include

        # Copy the library (looks like your build made a static lib 'libPROCESSOR.a')
        cp libPROCESSOR.a $out/lib/

        # Copy headers safely.
        # If your headers are in a subfolder, change './*.h' to './src/*.h' etc.
        # The '|| true' ensures the build doesn't crash if no headers are found.
        cp *.h $out/include/ || cp src/*.h $out/include/ || true

        echo "✅ Installed libPROCESSOR.a and headers to $out"
      '';
    };

    devShells.${system}.default = pkgs.mkShell {
      # This makes sure the shell also has the tools for manual debugging
      nativeBuildInputs = [pkgs.pkg-config pkgs.cmake];
      buildInputs = [pkgs.libjpeg_turbo];
    };
  };
}