{
  description = "A tool for composable tracking of scientific data provenance";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-22.05";
    flake-utils.url = "github:numtide/flake-utils";
  };

  # See https://old.reddit.com/r/Python/comments/npu66t/reproducible_python_environment_with_nix_flake/
  outputs = { self, nixpkgs, flake-utils }: 
    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
      let
        python = "python37";
        pkgs = (import nixpkgs {
          inherit system;
          config = {
            allowUnfree = true;
            cudaSupport = true;
          };
          overlays = [
          ];
        });
        pythonPackages = pkgs.${python}.pkgs;
        nancy = pythonPackages.buildPythonPackage {
          name = "nancy";
          src = ./.;
          propagatedBuildInputs = with pythonPackages; [
            dill
          ];
        };
        # core pkgs are those required to run headless scripts
        corePythonPkgs = ps: with ps; [
          numpy
          pandas
        ];
        corePythonEnv = pkgs.${python}.withPackages corePythonPkgs;
      in rec {
        defaultPackage = nancy;
        devShell = pkgs.mkShell { buildInputs = with pkgs; [ corePythonEnv ]; };
      });
}