{
  description = "clojure/tools.build packaged for NixOS.";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-22.05";
    utils.url = "github:numtide/flake-utils";
    clj2nix.url = "github:hlolli/clj2nix";
    build-tools-src = {
      url = "github:clojure/tools.build?tag=v0.6.8";
      flake = false;
    };
    gitignore = {
      url = "github:hercules-ci/gitignore.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    to-edn.url = "git+https://git.fudo.org/fudo-public/to-edn.git";
  };

  outputs =
    { self, nixpkgs, utils, clj2nix, build-tools-src, gitignore, to-edn, ... }:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages."${system}";
      build-tools-jar = pkgs.callPackage ./build.tools.nix {
        version = "0.6.8";
        inherit build-tools-src;
        inherit (gitignore.lib) gitignoreSource;
      };
      clj2nix-pkg = clj2nix.packages.${system}.clj2nix;
      update-deps = pkgs.writeShellScriptBin "update-deps.sh" ''
        ${clj2nix-pkg}/bin/clj2nix ${build-tools-src}/deps.edn deps.nix
      '';
    in {
      packages."${system}" = { inherit build-tools-jar; };
      defaultPackage."${system}" = self.packages."${system}".build-tools-jar;
      lib = {
        mkClojureLib =
          pkgs.callPackage ./mkClojureLib.nix { inherit (to-edn.lib) toEDN; };
      };
      devShell."${system}" = pkgs.mkShell {
        buildInputs = with pkgs; [ clojure clj2nix-pkg update-deps ];
      };
    };
}