diff --git a/qt4/CMakeLists.txt b/qt4/CMakeLists.txt
index caa3e4ca..088a529d 100644
--- a/qt4/CMakeLists.txt
+++ b/qt4/CMakeLists.txt
@@ -1,60 +1,67 @@
 if(ENABLE_QT4 AND NOT ENABLE_QT4_DEFINED)
   # ENABLE_QT4 is not defined on the command line
   find_package(Qt4 4.6.0)
   if(NOT Qt4_FOUND AND NOT QT4_FOUND)
     ## NB: this gets activated on OS X 10.9/MacPorts even when Qt is found,
     ## making it obligatory to define ENABLE_QT4 on the command line
     message(WARNING "Qt4 not found.")
     set(ENABLE_QT4 Off)
     set(ENABLE_QT4 Off PARENT_SCOPE)
   endif()
 endif()
 
+if (QTC_QT4_ENABLE_KDE AND NOT QTC_QT4_ENABLE_KDE_DEFINED)
+    find_package(KDE4)
+    if(NOT KDE4_FOUND)
+        set(QTC_QT4_ENABLE_KDE OFF)
+    endif()
+endif()
+
 add_definitions(-DQTC_UTILS_QT4 -DQTC_UTILS_QT)
 
 if(ENABLE_QT4)
   find_package(Qt4 4.6.0 REQUIRED)
   # search packages used by KDE
   if(QTC_QT4_ENABLE_KDE)
     find_package(KDE4 REQUIRED)
     include(KDE4Defaults)
     set(QTCURVE_STYLE_DIR "${PLUGIN_INSTALL_DIR}/plugins/styles/")
     if(NOT Q_WS_X11 OR NOT QTC_X11_FOUND)
       # Kwin headers uses a lot of xcb types and functions and we cannot
       # provide declarations for all of them even if they are not used.
       if(QTC_QT4_ENABLE_KWIN)
         message(WARNING "KWin4 support require Q_WS_X11 and libxcb headers.")
       endif()
       set(QTC_QT4_ENABLE_KWIN Off)
     elseif(NOT DEFINED QTC_QT4_ENABLE_KWIN)
       find_package(KDE4Workspace)
       set(QTC_QT4_ENABLE_KWIN "${KDE4Workspace_FOUND}")
     elseif(QTC_QT4_ENABLE_KWIN)
       find_package(KDE4Workspace REQUIRED)
     endif()
   else()
     set(QTC_QT4_ENABLE_KWIN Off)
     set(QTCURVE_STYLE_DIR "${QT_PLUGINS_DIR}/styles/")
   endif()
   add_definitions(${QT_DEFINITIONS})
   include_directories(
     "${CMAKE_CURRENT_BINARY_DIR}"
     "${CMAKE_CURRENT_SOURCE_DIR}"
     "${QT_INCLUDE_DIR}")
 
   if(QTC_QT4_ENABLE_KDE)
     add_definitions(${KDE4_DEFINITIONS} -DQTC_QT4_ENABLE_KDE)
     include_directories(${KDE4_INCLUDES})
   endif()
 else()
   set(QTC_QT4_ENABLE_KDE Off)
   set(QTC_QT4_ENABLE_KWIN Off)
 endif()
 
 add_subdirectory(colors)
 add_subdirectory(common)
 add_subdirectory(config)
 add_subdirectory(themes)
 add_subdirectory(kwin)
 add_subdirectory(kwinconfig)
 add_subdirectory(style)