{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        hPkgs = pkgs.haskellPackages;

        myDevTools = with hPkgs; [
          ghc
          ghcid
          ormolu
          hlint
          hoogle
          haskell-language-server
          implicit-hie
          retrie
        ];

        picsg = pkgs.haskellPackages.developPackage {
          root = ./.;
        };
      in
      {

        packages = {
          default = picsg;
          picsg = picsg;
          docker = pkgs.dockerTools.buildImage {
            name = "picgs";
            config = {
              Cmd = [ "${picsg}/bin/picsg" ];
            };
          };
        };

        devShells.default = pkgs.mkShell {
          buildInputs = myDevTools ++ [ hPkgs.cabal-install ];

          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath myDevTools;
        };
      });
}