anchor.diff:      owner = "libical";
       repo = "libical";
       rev = "v${version}";
  -    sha256 = "sha256-7M5GBteFKmKCB6556XXV4s6iIC/+3c3Ck17s/QX3Jus=";
  +    sha256 = "sha256-3D/0leI3LLKDFOXkKSrmMamLoaXdi/2Z4iPUXqgwtg8=";
     };
   
     strictDeps = true;
  
positive.code:     # Will appear in 3.1.0
      # https://github.com/libical/libical/issues/350
      ./respect-env-tzdir.patch
  
      # Fixes tests with 32-bit time_t
      # Remove with next version update (v3.0.16+)
      (fetchurl {
        url = "https://github.com/libical/libical/commit/4adc6f1d2b39a1cc3363b57215e12fa81076498b.patch";
        sha256 = "1k3hav0z86kc1xd1sk23b57aqqjk4gf73574w7f1m66cyz98bxr3";
      })
      (fetchurl {
        url = "https://github.com/libical/libical/commit/cce20bd051408b00521385c0bfb616ba068450d3.patch";
        sha256 = "097hqmagl0q5p38r1kvx0592cfac2y7jbdqlis6m8gbs812pbqfc";
      })
    ];
  
    # Using install check so we do not have to manually set
  
negative.code: { lib
  , stdenv
  , fetchFromGitHub
  , buildPackages
  , cmake
  , glib
  