anchor.diff:    '';
   
     inherit meta;
  -})
  +}) else stdenv.mkDerivation {
  +  inherit pname version;
  +
  +  src = fetchurl {
  +    url = "https://github.com/ankitects/anki/releases/download/${version}/anki-${version}-mac.dmg";
  +    sha256 = "1i6iidm5h8r9g801mvqxi2av03qdw3lr28056fv5ixnb5dq2wqim";
  +  };
  +
  +  nativeBuildInputs = [ undmg ];
  +  sourceRoot = ".";
  +
  +  installPhase = ''
  +    mkdir -p $out/Applications/
  +    cp -a Anki.app $out/Applications/
  +  '';
  +
  +  inherit meta;
  +}
  
positive.code: { fetchurl, stdenv, lib, buildFHSUserEnv, appimageTools, writeShellScript, anki }:
  
  let
    pname = "anki-bin";
    version = "2.1.36";
  
    unpacked = stdenv.mkDerivation {
  
negative.code: 
    meta = with lib; {
      inherit (anki.meta) license homepage description longDescription;
      platforms = [ "x86_64-linux" "x86_64-darwin" ];
      maintainers = with maintainers; [ atemu ];
    };
  in
  
  if stdenv.isLinux then buildFHSUserEnv (appimageTools.defaultFhsEnvArgs // {
    name = "anki";
  
    runScript = writeShellScript "anki-wrapper.sh" ''
  