diff --git a/pkgs/applications/audio/tomahawk/default.nix b/pkgs/applications/audio/tomahawk/default.nix
index 4140c5da5a459c..78bd4338353992 100644
--- a/pkgs/applications/audio/tomahawk/default.nix
+++ b/pkgs/applications/audio/tomahawk/default.nix
@@ -51,5 +51,6 @@ stdenv.mkDerivation rec {
     homepage = http://tomahawk-player.org/;
     license = licenses.gpl3Plus;
     platforms = platforms.all;
+    broken = true; # 2018-06-25
   };
 }
diff --git a/pkgs/development/libraries/phonon/backends/vlc.nix b/pkgs/development/libraries/phonon/backends/vlc.nix
index 643e36ba6cd6ce..0487886a896657 100644
--- a/pkgs/development/libraries/phonon/backends/vlc.nix
+++ b/pkgs/development/libraries/phonon/backends/vlc.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchurl, cmake, phonon, pkgconfig, vlc
 , extra-cmake-modules, qtbase ? null, qtx11extras ? null, qt4 ? null
-, withQt5 ? false
+, withQt4 ? false
 , debug ? false
 }:
 
@@ -11,11 +11,12 @@ let
   pname = "phonon-backend-vlc";
 in
 
-assert withQt5 -> qtbase != null;
-assert withQt5 -> qtx11extras != null;
+assert withQt4 -> qt4 != null;
+assert !withQt4 -> qtbase != null;
+assert !withQt4 -> qtx11extras != null;
 
 stdenv.mkDerivation rec {
-  name = "${pname}-${if withQt5 then "qt5" else "qt4"}-${v}";
+  name = "${pname}-${if withQt4 then "qt4" else "qt5"}-${v}";
 
   meta = with stdenv.lib; {
     homepage = https://phonon.kde.org/;
@@ -30,11 +31,11 @@ stdenv.mkDerivation rec {
 
   buildInputs =
     [ phonon vlc ]
-    ++ (if withQt5 then [ qtbase qtx11extras ] else [ qt4 ]);
+    ++ (if withQt4 then [ qt4 ] else [ qtbase qtx11extras ]);
 
-  nativeBuildInputs = [ cmake pkgconfig ] ++ optional withQt5 extra-cmake-modules;
+  nativeBuildInputs = [ cmake pkgconfig ] ++ optional (!withQt4) extra-cmake-modules;
 
   cmakeFlags =
     [ "-DCMAKE_BUILD_TYPE=${if debug then "Debug" else "Release"}" ]
-    ++ optional withQt5 "-DPHONON_BUILD_PHONON4QT5=ON";
+    ++ optional (!withQt4) "-DPHONON_BUILD_PHONON4QT5=ON";
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5369510816610d..85fa455d56d746 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11196,7 +11196,10 @@ with pkgs;
 
   phonon-backend-gstreamer = callPackage ../development/libraries/phonon/backends/gstreamer.nix {};
 
-  phonon-backend-vlc = callPackage ../development/libraries/phonon/backends/vlc.nix {};
+  # TODO(@Ma27) get rid of that as soon as QT4 can be dropped
+  phonon-backend-vlc = callPackage ../development/libraries/phonon/backends/vlc.nix {
+    withQt4 = true;
+  };
 
   inherit (callPackage ../development/libraries/physfs { })
     physfs_2