anchor.diff:  , stdenv
   , substituteAll
   , fetchurl
  -, fetchpatch
   , pkg-config
   , gettext
   , docbook-xsl-nons
  
positive.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/gtk+/${lib.versions.majorMinor version}/gtk+-${version}.tar.xz";
      sha256 = "sha256-Qjw+f9tMRZ7oieNf1Ncf0mI1YlQcEEGxHAflrR/xC/k=";
    };
  
    patches = [
  
negative.code:     # e.g. https://gitlab.gnome.org/GNOME/gtk/blob/3.24.4/gtk/gtk-launch.c#L31-33
      # https://gitlab.gnome.org/GNOME/gtk/merge_requests/536
      ./patches/3.0-darwin-x11.patch
    ];
  
    nativeBuildInputs = [
  