anchor.diff:  { lib
  -, stdenv
  +, stdenvNoCC
   , fetchFromGitHub
   , fetchurl
   , glib
  
positive.code: lib.checkListOfEnum "${pname}: opacity variants" [ "standard" "solid" ] opacityVariants
  lib.checkListOfEnum "${pname}: theme variants" [ "default" "blue" "purple" "pink" "red" "orange" "yellow" "green" "grey" "all" ] themeVariants
  
  stdenv.mkDerivation rec {
    inherit pname;
    version = "2022-06-07";
  
    srcs = [
      (fetchFromGitHub {
        owner = "vinceliuice";
        repo = pname;
        rev = version;
        sha256 = "sha256-OEqB2PSZ5KoxXAUhlyT1PRUzckVz+jTCIoAqP8gVqTk=";
      })
    ]
    ++
  
negative.code:       install -D -t $out/share/wallpapers ../"macOS Mojave Wallpapers"/*
      ''}
  
      # Replace duplicate files with soft links to the first file in each
      # set of duplicates, reducing the installed size in about 53%
      jdupes --quiet --link-soft --recurse $out/share
  
      runHook postInstall
    '';
  