{
  description = "Add ruby characters to fonts.";

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

  outputs =
    {
      self,
      nixpkgs,
      crane,
      flake-utils,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        craneLib = crane.mkLib pkgs;

        commonArgs = {
          src = craneLib.cleanCargoSource ./.;
          strictDeps = true;
          meta.mainProgram = "rubify";
        };

        rubify = craneLib.buildPackage (
          commonArgs
          // {
            cargoArtifacts = craneLib.buildDepsOnly commonArgs;
          }
        );
      in
      {
        packages.default = rubify;

        apps.default = flake-utils.lib.mkApp {
          drv = rubify;
        };
      }
    );
}