anchor.diff:  
       srcVerification = fetchurl {
         urls = [
  -        ("https://download.nvidia.com/XFree86/Linux-x86/${version}/"
  -            + "NVIDIA-Linux-x86-${version}.run")
  +        ("https://download.nvidia.com/XFree86/Linux-x86_64/${version}/"
  +            + "NVIDIA-Linux-x86_64-${version}.run")
           ("https://download.nvidia.com/XFree86/Linux-x86_64/${version}/"
               + "NVIDIA-Linux-x86_64-${version}"
               + "${if channel == "tesla" then "" else "-no-compat32"}.run")
  
positive.code:   src = fetchurl {
      url =
        if elem targetSystem platforms.i686-linux then
          "mirror://nvidia/XFree86/Linux-x86/${version}/"
            + "NVIDIA-Linux-x86-${version}.run"
        else if elem targetSystem platforms.x86_64-linux then
          "mirror://nvidia/XFree86/Linux-x86_64/${version}/"
            + "NVIDIA-Linux-x86_64-${version}"
  
negative.code:       maxXorgVersion = "1.19";
      };
      beta = {
        versionMajor = "396";
        versionMinor = "18";
        sha256i686   = "63223406a552fd50808dca0b6864dccbc265dfc614dde89492f1e53afa7cce0b";
        sha256x86_64 = "0d39bd3e1727e5849401db7fa04d667662b6b9a80b2a11a897bb4ba0e7273208";
        maxLinuxVersion = "4.16";
        maxXorgVersion = "1.19";
      };
      # Update to which ever channel has the latest release at the time.
      latest = beta;
    };
    source = sources."${channel}";
  
  