{
  nixConfig.extra-substituters = [
    "https://tweag-jupyter.cachix.org"
  ];
  nixConfig.extra-trusted-public-keys = [
    "tweag-jupyter.cachix.org-1:UtNH4Zs6hVUFpFBTLaA4ejYavPo5EFFqgd7G7FxGW9g="
  ];

  inputs.flake-compat.url = "github:edolstra/flake-compat";
  inputs.flake-compat.flake = false;
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
  inputs.jupyenv.url = "github:tweag/jupyenv";

  outputs =
    { flake-utils
    , jupyenv
    , ...
    } @ inputs:
    flake-utils.lib.eachSystem
      [
        flake-utils.lib.system.x86_64-linux
      ]
      (
        system:
        let
          inherit (jupyenv.lib.${system}) mkJupyterlabNew;
          jupyterlab = mkJupyterlabNew ({ ... }: {
            nixpkgs = inputs.nixpkgs;
            imports = [ (import ./kernels.nix) ];
          });
        in
        {
          packages = { inherit jupyterlab; };
          packages.default = jupyterlab;
          apps.default.program = "${jupyterlab}/bin/jupyter-lab";
          apps.default.type = "app";
        }
      );
}