anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "libical";
  -  version = "3.0.8";
  +  version = "3.0.9";
   
     outputs = [ "out" "dev" ]; # "devdoc" ];
   
  
positive.code:     owner = "libical";
      repo = "libical";
      rev = "v${version}";
      sha256 = "0pkh74bfrgp1slv8wsv7lbmal2m7qkixwm5llpmfwaiv14njlp68";
    };
  
    nativeBuildInputs = [
  
negative.code:     # Will appear in 3.1.0
      # https://github.com/libical/libical/issues/350
      ./respect-env-tzdir.patch
    ];
  
    # Using install check so we do not have to manually set
  