anchor.diff:      owner = "libical";
       repo = "libical";
       rev = "v${version}";
  -    sha256 = "0pkh74bfrgp1slv8wsv7lbmal2m7qkixwm5llpmfwaiv14njlp68";
  +    sha256 = "sha256-efdiGktLGITaQ6VinnfYG52fMhO0Av+JKROt2kTvS1U=";
     };
   
     nativeBuildInputs = [
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "libical";
    version = "3.0.8";
  
    outputs = [ "out" "dev" ]; # "devdoc" ];
  
  
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
  