anchor.diff:        cp "${desktopItem}"/share/applications/* "$out/share/applications/"
       '';
     };
  -in stdenv.mkDerivation {
  +in
  +stdenv.mkDerivation {
     pname = "ciscoPacketTracer8";
     inherit version;
   
  
positive.code: }:
  
  let
    version = "8.1.1";
  
    ptFiles = stdenv.mkDerivation {
      name = "PacketTracer8Drv";
  
negative.code:     dontUnpack = true;
      src = requireFile {
        name = "CiscoPacketTracer_${builtins.replaceStrings ["."] [""] version}_Ubuntu_64bit.deb";
        sha256 = "1b19885d59f6130ee55414fb02e211a1773460689db38bfd1ac7f0d45117ed16";
        url = "https://www.netacad.com";
      };
  
  