anchor.diff:  { lib
   , stdenv
   , fetchFromGitHub
  -, fetchpatch
   , buildPackages
   , cmake
   , glib
  
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
  