{
  inputs = {
    crane.url = "github:ipetkov/crane";
    crane.inputs.nixpkgs.follows = "nixpkgs";
    fenix.url = "github:nix-community/fenix";
    fenix.inputs.nixpkgs.follows = "nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };

  outputs = {
    crane,
    flake-utils,
    nixpkgs,
    ...
  } @ inputs:
    flake-utils.lib.eachDefaultSystem (
      system: let
        inherit (pkgs) lib;
        pkgs = import nixpkgs {inherit system;};
        fenix = inputs.fenix.packages.${system};
        craneLib = crane.lib.${system}.overrideToolchain toolchain.toolchain;
        mkSrc = extraPaths:
          with lib.fileset; let
            root = ./.;
            rustFiles = fromSource (craneLib.cleanCargoSource root);
            fileset = union rustFiles (unions extraPaths);
          in
            toSource {inherit root fileset;};

        ## Customize here ##
        toolchain = fenix.complete; # or fenix.stable;
        stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.stdenv;
      in {
        packages.default = craneLib.buildPackage {
          inherit stdenv;
          src = mkSrc [];
          strictDeps = true;
          buildInputs =
            [
              # Add additional build inputs here
            ]
            ++ lib.optionals pkgs.stdenv.isDarwin [
              # Additional darwin specific inputs can be set here
              pkgs.libiconv
            ];
          # Additional environment variables can be set directly
          # MY_CUSTOM_VAR = "some value";
        };

        devShells.default =
          pkgs.mkShell.override {inherit stdenv;}
          {
            nativeBuildInputs = with pkgs;
              [
                # Add additional build inputs here
              ]
              ++ (with toolchain; [
                cargo
                clippy
                rustfmt
                rustc
                fenix.rust-analyzer
              ]);
            RUST_SRC_PATH = "${toolchain.rust-src}/lib/rustlib/src/rust/library";
          };
      }
    );
}