anchor.diff: -{ stdenv, fetchurl, config
  +{ stdenv
  +, fetchurl
  +, config
   , acceptLicense ? config.joypixels.acceptLicense or false
   }:
   
  -let inherit (stdenv.hostPlatform.parsed) kernel;
  +let
  +  inherit (stdenv.hostPlatform.parsed) kernel;
   
  -    systemSpecific = {
  -      darwin = rec {
  -        systemTag =  "nix-darwin";
  -        capitalized = systemTag;
  -        fontFile = "JoyPixels-SBIX.ttf";
  -      };
  -    }.${kernel.name} or rec {
  -        systemTag = "nixos";
  -        capitalized = "NixOS";
  -        fontFile = "joypixels-android.ttf";
  -      };
  +  systemSpecific = {
  +    darwin = rec {
  +      systemTag =  "nix-darwin";
  +      capitalized = systemTag;
  +      fontFile = "JoyPixels-SBIX.ttf";
  +    };
  +  }.${kernel.name} or rec {
  +    systemTag = "nixos";
  +    capitalized = "NixOS";
  +    fontFile = "joypixels-android.ttf";
  +  };
   
  -    joypixels-free-license = with systemSpecific; {
  -      spdxId = "LicenseRef-JoyPixels-Free-6.0";
  -      fullName = "JoyPixels Free License Agreement 6.0";
  -      url = "https://cdn.joypixels.com/distributions/${systemTag}/license/free-license.pdf";
  -      free = false;
  -    };
  +  joypixels-free-license = with systemSpecific; {
  +    spdxId = "LicenseRef-JoyPixels-Free-6.0";
  +    fullName = "JoyPixels Free License Agreement 6.0";
  +    url = "https://cdn.joypixels.com/distributions/${systemTag}/license/free-license.pdf";
  +    free = false;
  +  };
   
  -    joypixels-license-appendix = with systemSpecific; {
  -      spdxId = "LicenseRef-JoyPixels-NixOS-Appendix";
  -      fullName = "JoyPixels ${capitalized} License Appendix";
  -      url = "https://cdn.joypixels.com/distributions/${systemTag}/appendix/joypixels-license-appendix.pdf";
  -      free = false;
  -    };
  +  joypixels-license-appendix = with systemSpecific; {
  +    spdxId = "LicenseRef-JoyPixels-NixOS-Appendix";
  +    fullName = "JoyPixels ${capitalized} License Appendix";
  +    url = "https://cdn.joypixels.com/distributions/${systemTag}/appendix/joypixels-license-appendix.pdf";
  +    free = false;
  +  };
   
  -    throwLicense = throw ''
  -      Use of the JoyPixels font requires acceptance of the license.
  -        - ${joypixels-free-license.fullName} [1]
  -        - ${joypixels-license-appendix.fullName} [2]
  +  throwLicense = throw ''
  +    Use of the JoyPixels font requires acceptance of the license.
  +      - ${joypixels-free-license.fullName} [1]
  +      - ${joypixels-license-appendix.fullName} [2]
   
  -      You can express acceptance by setting acceptLicense to true in your
  -      configuration. Note that this is not a free license so it requires allowing
  -      unfree licenses.
  +    You can express acceptance by setting acceptLicense to true in your
  +    configuration. Note that this is not a free license so it requires allowing
  +    unfree licenses.
   
  -      configuration.nix:
  -        nixpkgs.config.allowUnfree = true;
  -        nixpkgs.config.joypixels.acceptLicense = true;
  +    configuration.nix:
  +      nixpkgs.config.allowUnfree = true;
  +      nixpkgs.config.joypixels.acceptLicense = true;
   
  -      config.nix:
  -        allowUnfree = true;
  -        joypixels.acceptLicense = true;
  +    config.nix:
  +      allowUnfree = true;
  +      joypixels.acceptLicense = true;
   
  -      [1]: ${joypixels-free-license.url}
  -      [2]: ${joypixels-license-appendix.url}
  -    '';
  +    [1]: ${joypixels-free-license.url}
  +    [2]: ${joypixels-license-appendix.url}
  +  '';
   
   in
   
  
positive.code:   dontUnpack = true;
  
    installPhase = with systemSpecific; ''
      install -Dm644 $src $out/share/fonts/truetype/${fontFile}
    '';
  
    meta = with stdenv.lib; {
  
negative.code:       of files ranging from png, svg, iconjar, sprites, and fonts.
      '';
      homepage = "https://www.joypixels.com/fonts";
      license =
        let
          free-license = joypixels-free-license;
          appendix = joypixels-license-appendix;
        in with systemSpecific; {
          spdxId = "LicenseRef-JoyPixels-Free-6.0-with-${capitalized}-Appendix";
          fullName = "${free-license.fullName} with ${appendix.fullName}";
  