anchor.diff:      autoreconfHook
       wrapGAppsHook
       pkg-config
  -    libxmlxx3
       gettext
       yelp-tools
       itstool
  
positive.code: , gettext
  , yelp-tools
  , itstool
  , libxmlxx3
  , python
  , pygobject3
  , gtk3
  
negative.code: 
  buildPythonApplication rec {
    pname = "orca";
    version = "41.0";
  
    format = "other";
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.major version}/${pname}-${version}.tar.xz";
      sha256 = "dpflFEXhn9d05osWCtr2aHuAgXLeBBdgLhaXZra21L0=";
    };
  
    patches = [
  