anchor.diff:      dontUnpack = true;
       src = requireFile {
         name = "CiscoPacketTracer_${builtins.replaceStrings ["."] [""] version}_Ubuntu_64bit.deb";
  -      sha256 = "77a25351b016faed7c78959819c16c7013caa89c6b1872cb888cd96edd259140";
  +      sha256 = "08c53171aa0257a64ae7de1540f242214033cfa4f879fbc9fed5cc0d32232abf";
         url = "https://www.netacad.com";
       };
   
  
positive.code: }:
  
  let
    version = "8.0.1";
  
    ptFiles = stdenv.mkDerivation {
      name = "PacketTracer8Drv";
  
negative.code:       libXrandr
        libXrender
        libXScrnSaver
        libXtst
        xcbutilimage
        xcbutilkeysyms
        xcbutilrenderutil
  