diff --git a/pkgs/applications/networking/irc/quassel/default.nix b/pkgs/applications/networking/irc/quassel/default.nix
index f48309d0b049..d631f4aa2146 100644
--- a/pkgs/applications/networking/irc/quassel/default.nix
+++ b/pkgs/applications/networking/irc/quassel/default.nix
@@ -1,15 +1,26 @@
 { monolithic ? true # build monolithic Quassel
 , daemon ? false # build Quassel daemon
 , client ? false # build Quassel client
-, previews ? false # enable webpage previews on hovering over URLs
 , tag ? "" # tag added to the package name
-, withKDE ? stdenv.isLinux # enable KDE integration
-, kdelibs ? null
 , static ? false # link statically
 
-, stdenv, fetchurl, cmake, makeWrapper, qt, automoc4, phonon, dconf, qca2 }:
+, stdenv, fetchurl, cmake, makeWrapper, dconf
+, qtbase, qtscript
+, phonon, libdbusmenu, qca-qt5
 
-let buildClient = monolithic || client;
+, withKDE ? stdenv.isLinux # enable KDE integration
+, extra-cmake-modules
+, kconfigwidgets
+, kcoreaddons
+, knotifications
+, knotifyconfig
+, ktextwidgets
+, kwidgetsaddons
+, kxmlgui
+}:
+
+let
+    buildClient = monolithic || client;
     buildCore = monolithic || daemon;
 in
 
@@ -17,7 +28,6 @@ assert stdenv.isLinux;
 
 assert monolithic -> !client && !daemon;
 assert client || daemon -> !monolithic;
-assert withKDE -> kdelibs != null;
 assert !buildClient -> !withKDE; # KDE is used by the client only
 
 let
@@ -31,21 +41,28 @@ in with stdenv; mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  buildInputs =
-       [ cmake makeWrapper qt ]
-    ++ lib.optionals buildCore [qca2]
-    ++ lib.optionals withKDE [automoc4 kdelibs phonon];
+  # Prevent ``undefined reference to `qt_version_tag''' in SSL check
+  NIX_CFLAGS_COMPILE = [ "-DQT_NO_VERSION_TAGGING=1" ];
 
-  NIX_CFLAGS_COMPILE = "-fPIC";
+  buildInputs =
+       [ cmake makeWrapper qtbase ]
+    ++ lib.optionals buildCore [qtscript qca-qt5]
+    ++ lib.optionals buildClient [libdbusmenu phonon]
+    ++ lib.optionals (buildClient && withKDE) [
+      extra-cmake-modules kconfigwidgets kcoreaddons
+      knotifications knotifyconfig ktextwidgets kwidgetsaddons
+      kxmlgui
+    ];
 
   cmakeFlags = [
-    "-DEMBED_DATA=OFF" ]
+    "-DEMBED_DATA=OFF"
+    "-DUSE_QT5=ON"
+  ]
     ++ edf static "STATIC"
     ++ edf monolithic "WANT_MONO"
     ++ edf daemon "WANT_CORE"
     ++ edf client "WANT_QTCLIENT"
-    ++ edf withKDE "WITH_KDE"
-    ++ edf previews "WITH_WEBKIT";
+    ++ edf withKDE "WITH_KDE";
 
   preFixup =
     lib.optionalString buildClient ''
@@ -66,6 +83,6 @@ in with stdenv; mkDerivation rec {
     license = stdenv.lib.licenses.gpl3;
     maintainers = with maintainers; [ phreedom ttuegel ];
     repositories.git = https://github.com/quassel/quassel.git;
-    inherit (qt.meta) platforms;
+    inherit (qtbase.meta) platforms;
   };
 }
diff --git a/pkgs/applications/networking/irc/quassel/qt-5.nix b/pkgs/applications/networking/irc/quassel/qt-5.nix
deleted file mode 100644
index d631f4aa2146..000000000000
--- a/pkgs/applications/networking/irc/quassel/qt-5.nix
+++ /dev/null
@@ -1,88 +0,0 @@
-{ monolithic ? true # build monolithic Quassel
-, daemon ? false # build Quassel daemon
-, client ? false # build Quassel client
-, tag ? "" # tag added to the package name
-, static ? false # link statically
-
-, stdenv, fetchurl, cmake, makeWrapper, dconf
-, qtbase, qtscript
-, phonon, libdbusmenu, qca-qt5
-
-, withKDE ? stdenv.isLinux # enable KDE integration
-, extra-cmake-modules
-, kconfigwidgets
-, kcoreaddons
-, knotifications
-, knotifyconfig
-, ktextwidgets
-, kwidgetsaddons
-, kxmlgui
-}:
-
-let
-    buildClient = monolithic || client;
-    buildCore = monolithic || daemon;
-in
-
-assert stdenv.isLinux;
-
-assert monolithic -> !client && !daemon;
-assert client || daemon -> !monolithic;
-assert !buildClient -> !withKDE; # KDE is used by the client only
-
-let
-  edf = flag: feature: [("-D" + feature + (if flag then "=ON" else "=OFF"))];
-  source = import ./source.nix { inherit fetchurl; };
-
-in with stdenv; mkDerivation rec {
-  inherit (source) src version;
-
-  name = "quassel${tag}-${version}";
-
-  enableParallelBuilding = true;
-
-  # Prevent ``undefined reference to `qt_version_tag''' in SSL check
-  NIX_CFLAGS_COMPILE = [ "-DQT_NO_VERSION_TAGGING=1" ];
-
-  buildInputs =
-       [ cmake makeWrapper qtbase ]
-    ++ lib.optionals buildCore [qtscript qca-qt5]
-    ++ lib.optionals buildClient [libdbusmenu phonon]
-    ++ lib.optionals (buildClient && withKDE) [
-      extra-cmake-modules kconfigwidgets kcoreaddons
-      knotifications knotifyconfig ktextwidgets kwidgetsaddons
-      kxmlgui
-    ];
-
-  cmakeFlags = [
-    "-DEMBED_DATA=OFF"
-    "-DUSE_QT5=ON"
-  ]
-    ++ edf static "STATIC"
-    ++ edf monolithic "WANT_MONO"
-    ++ edf daemon "WANT_CORE"
-    ++ edf client "WANT_QTCLIENT"
-    ++ edf withKDE "WITH_KDE";
-
-  preFixup =
-    lib.optionalString buildClient ''
-        wrapProgram "$out/bin/quassel${lib.optionalString client "client"}" \
-          --prefix GIO_EXTRA_MODULES : "${dconf}/lib/gio/modules"
-    '';
-
-  meta = with stdenv.lib; {
-    homepage = http://quassel-irc.org/;
-    description = "Qt/KDE distributed IRC client suppporting a remote daemon";
-    longDescription = ''
-      Quassel IRC is a cross-platform, distributed IRC client,
-      meaning that one (or multiple) client(s) can attach to
-      and detach from a central core -- much like the popular
-      combination of screen and a text-based IRC client such
-      as WeeChat, but graphical (based on Qt4/KDE4 or Qt5/KF5).
-    '';
-    license = stdenv.lib.licenses.gpl3;
-    maintainers = with maintainers; [ phreedom ttuegel ];
-    repositories.git = https://github.com/quassel/quassel.git;
-    inherit (qtbase.meta) platforms;
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 89ef5f5e4f78..880fa138b9c5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14843,7 +14843,7 @@ with pkgs;
 
   qtscrobbler = callPackage ../applications/audio/qtscrobbler { };
 
-  quassel = qt5.callPackage ../applications/networking/irc/quassel/qt-5.nix {
+  quassel = qt5.callPackage ../applications/networking/irc/quassel {
     monolithic = true;
     daemon = false;
     client = false;
@@ -16783,49 +16783,6 @@ with pkgs;
 
         qtcurve = callPackage ../misc/themes/qtcurve { };
 
-        quassel = callPackage ../applications/networking/irc/quassel rec {
-          monolithic = true;
-          daemon = false;
-          client = false;
-          withKDE = stdenv.isLinux;
-          qt = if withKDE then qt4 else qt5; # KDE supported quassel cannot build with qt5 yet (maybe in 0.12.0)
-          dconf = gnome3.dconf;
-        };
-
-        quasselWithoutKDE = (quassel.override {
-          monolithic = true;
-          daemon = false;
-          client = false;
-          withKDE = false;
-          #qt = qt5;
-          tag = "-without-kde";
-        });
-
-        quasselDaemon = (quassel.override {
-          monolithic = false;
-          daemon = true;
-          client = false;
-          withKDE = false;
-          #qt = qt5;
-          tag = "-daemon";
-        });
-
-        quasselClient = (quassel.override {
-          monolithic = false;
-          daemon = false;
-          client = true;
-          tag = "-client";
-        });
-
-        quasselClientWithoutKDE = (quasselClient.override {
-          monolithic = false;
-          daemon = false;
-          client = true;
-          withKDE = false;
-          #qt = qt5;
-          tag = "-client-without-kde";
-        });
-
         rekonq-unwrapped = callPackage ../applications/networking/browsers/rekonq { };
         rekonq = wrapFirefox rekonq-unwrapped { };