Index: libs/3rdparty/qt4/CMakeLists.txt
===================================================================
--- libs/3rdparty/qt4/CMakeLists.txt	(revision 633)
+++ libs/3rdparty/qt4/CMakeLists.txt	(revision 700)
@@ -21,4 +21,8 @@
 
 if (CMAKE_BUILD_TYPE MATCHES Debug)
+	if(NOT QT_QTWEBKIT_LIBRARY_DEBUG)
+                message(FATAL_ERROR "Qt webkit debug is not installed")
+        endif()
+	
 	ow_add_public_libraries(
 		${QT_QTCORE_LIBRARY_DEBUG}
@@ -70,4 +74,7 @@
 	endif (UNIX)
 else (CMAKE_BUILD_TYPE MATCHES Debug)
+	if(NOT QT_QTWEBKIT_LIBRARY)
+                message(FATAL_ERROR "Qt webkit is not installed")
+        endif()
 	ow_add_public_libraries(
 		${QT_QTCORE_LIBRARY_RELEASE}