vlc_qt5: build with Qt 5.5

pkgs/applications/video/vlc/default.nix

···
 , libass, libva, libdvbpsi, libdc1394, libraw1394, libopus
 , libvdpau, libsamplerate
 , onlyLibVLC ? false
-, qt4 ? null, qt5 ? null, withQt5 ? false
+, qt4 ? null
+, withQt5 ? false, qtbase ? null
 , jackSupport ? false
 }:
 
 with stdenv.lib;
 
-assert (withQt5 -> qt5 != null);
+assert (withQt5 -> qtbase != null);
 assert (!withQt5 -> qt4 != null);
 
 stdenv.mkDerivation rec {
···
       xorg.xlibsWrapper xorg.libXv xorg.libXvMC xorg.libXpm xorg.xcbutilkeysyms
       libdc1394 libraw1394 libopus libebml libmatroska libvdpau libsamplerate
     ]
-    ++ (if withQt5 then with qt5; [ base ] else [qt4])
+    ++ [(if withQt5 then qtbase else qt4)]
     ++ optional jackSupport libjack2;
 
   nativeBuildInputs = [ pkgconfig ];

pkgs/top-level/all-packages.nix

···
 
     qca-qt5 = callPackage ../development/libraries/qca-qt5 { };
 
+    vlc = callPackage ../applications/video/vlc {
+      qt4 = null;
+      withQt5 = true;
+    };
+
   };
 
   qt55Libs = lib.makeScope qt55.newScope qt5LibsFun;
···
     ffmpeg = ffmpeg_2;
   };
 
-  vlc_qt5 = vlc.override {
-    withQt5 = true;
-  };
+  vlc_qt5 = qt5Libs.vlc;
 
   vmpk = callPackage ../applications/audio/vmpk { };