anchor.diff:  , stdenv
   , substituteAll
   , fetchurl
  -, fetchpatch
   , pkg-config
   , gettext
   , docbook-xsl-nons
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "gtk+3";
    version = "3.24.31";
  
    outputs = [ "out" "dev" ] ++ lib.optional withGtkDoc "devdoc";
    outputBin = "dev";
  
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 = [
  