anchor.diff:      dontUnpack = true;
       src = requireFile {
         name = "CiscoPacketTracer_${builtins.replaceStrings ["."] [""] version}_Ubuntu_64bit.deb";
  -      sha256 = "08c53171aa0257a64ae7de1540f242214033cfa4f879fbc9fed5cc0d32232abf";
  +      sha256 = "1b19885d59f6130ee55414fb02e211a1773460689db38bfd1ac7f0d45117ed16";
         url = "https://www.netacad.com";
       };
   
  
positive.code: }:
  
  let
    version = "8.1.1";
  
    ptFiles = stdenv.mkDerivation {
      name = "PacketTracer8Drv";
  
negative.code:       cp "${desktopItem}"/share/applications/* "$out/share/applications/"
      '';
    };
  in
  stdenv.mkDerivation {
    pname = "ciscoPacketTracer8";
    inherit version;
  
  