qt5.qtmacextras: include cf-private on darwin

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_NSData", referenced from:
objc-class-ref in qmacfunctions.o
"_OBJC_CLASS_$_NSMutableArray", referenced from:
objc-class-ref in qmactoolbar.o
objc-class-ref in qmactoolbardelegate.o
ld: symbol(s) not found for architecture x86_64

pkgs/development/libraries/qt-5/5.11/default.nix

···
   stdenv, fetchurl, fetchFromGitHub, makeSetupHook,
   bison, cups ? null, harfbuzz, libGL, perl,
   gstreamer, gst-plugins-base, gtk3, dconf,
+  cf-private,
 
   # options
   developerBuild ? false,
···
       qtgraphicaleffects = callPackage ../modules/qtgraphicaleffects.nix {};
       qtimageformats = callPackage ../modules/qtimageformats.nix {};
       qtlocation = callPackage ../modules/qtlocation.nix {};
-      qtmacextras = callPackage ../modules/qtmacextras.nix {};
+      qtmacextras = callPackage ../modules/qtmacextras.nix {
+        inherit cf-private;
+      };
       qtmultimedia = callPackage ../modules/qtmultimedia.nix {
         inherit gstreamer gst-plugins-base;
       };

pkgs/development/libraries/qt-5/5.9/default.nix

···
   stdenv, fetchurl, makeSetupHook,
   bison, cups ? null, harfbuzz, libGL, perl,
   gstreamer, gst-plugins-base, gtk3, dconf,
+  cf-private,
 
   # options
   developerBuild ? false,
···
       qtgraphicaleffects = callPackage ../modules/qtgraphicaleffects.nix {};
       qtimageformats = callPackage ../modules/qtimageformats.nix {};
       qtlocation = callPackage ../modules/qtlocation.nix {};
-      qtmacextras = callPackage ../modules/qtmacextras.nix {};
+      qtmacextras = callPackage ../modules/qtmacextras.nix {
+        inherit cf-private;
+      };
       qtmultimedia = callPackage ../modules/qtmultimedia.nix {
         inherit gstreamer gst-plugins-base;
       };

pkgs/development/libraries/qt-5/modules/qtmacextras.nix

···
-{ qtModule, qtbase, lib }:
+{ stdenv, qtModule, qtbase, cf-private }:
 
 qtModule {
   name = "qtmacextras";
-  qtInputs = [ qtbase ];
-  meta = with lib; {
+  qtInputs = [ qtbase ]
+    # Needed for _OBJC_CLASS_$_NSData symbols.
+    ++ stdenv.lib.optional stdenv.isDarwin cf-private;
+  meta = with stdenv.lib; {
     maintainers = with maintainers; [ periklis ];
     platforms = platforms.darwin;
   };

pkgs/top-level/all-packages.nix

···
       harfbuzz = harfbuzzFull;
       inherit libGL;
       inherit perl;
+      inherit (darwin) cf-private;
       inherit (gst_all_1) gstreamer gst-plugins-base;
       inherit (gnome3) gtk3 dconf;
     });
···
       harfbuzz = harfbuzzFull;
       inherit libGL;
       inherit perl;
+      inherit (darwin) cf-private;
+      inherit (gnome3) gtk3 dconf;
       inherit (gst_all_1) gstreamer gst-plugins-base;
-      inherit (gnome3) gtk3 dconf;
     });
 
   libsForQt511 = recurseIntoAttrs (lib.makeScope qt511.newScope mkLibsForQt5);