anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "gnome-calendar";
  -  version = "42.beta";
  +  version = "42.rc";
   
     src = fetchurl {
       url = "mirror://gnome/sources/${pname}/${lib.versions.major version}/${pname}-${version}.tar.xz";
  -    sha256 = "TTNcGt7tjqLjSuHmt5uVtlFpaHsmjjlsek4l9+rZdlE=";
  +    sha256 = "1k2ZG3WbwvdvjJQFicd9gb2oEergo5+9kyoIV/R0eZQ=";
     };
  -
  -  patches = [
  -    # Fix postinstall referring to gtk-update-icon-cache
  -    (fetchpatch {
  -      url = "https://gitlab.gnome.org/GNOME/gnome-calendar/-/commit/b7e84c432664f76f10680c04781ab5c3cafdd247.patch";
  -      sha256 = "ahJwspsnU6uT0mc1W+aWPWgp/9+lVF8H+dAK/IV7qgM=";
  -    })
  -  ];
   
     nativeBuildInputs = [
       meson
  
positive.code: { stdenv
  , lib
  , fetchurl
  , fetchpatch
  , meson
  , ninja
  , pkg-config
  
negative.code: , libgweather
  , geoclue2
  , geocode-glib
  , gettext
  , libxml2
  , gnome
  