anchor.diff:    propagatedBuildInputs = [ clutter gtk3 ];
     nativeBuildInputs = [ meson ninja pkg-config gobject-introspection ];
   
  +  postPatch = ''
  +    # ld: malformed 32-bit x.y.z version number: =1
  +    substituteInPlace meson.build \
  +      --replace "host_system == 'darwin'" "false"
  +  '';
  +
     postBuild = "rm -rf $out/share/gtk-doc";
   
     passthru = {
  
positive.code:     homepage = "http://www.clutter-project.org/";
      license = lib.licenses.lgpl2Plus;
      maintainers = with lib.maintainers; [ ];
      platforms = lib.platforms.gnu ++ lib.platforms.linux;  # arbitrary choice
    };
  }
  
negative.code: { fetchurl
  , lib
  , stdenv
  , pkg-config
  , meson
  , ninja
  , gobject-introspection
  , clutter
  , gtk3
  , gnome
  }:
  
  let
    pname = "clutter-gtk";
  