diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c0cca3d..ecd938d 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,81 +1,80 @@
 
 #### Qt 4 and 5 ####
 if(QT5_BUILD)
   find_package(ECM 1.1.0 REQUIRED NO_MODULE)
   set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
 
   find_package(Qt5Core REQUIRED)
   find_package(Qt5Test REQUIRED)
 
   include("../cmake/modules/ECMQt4To5Porting.cmake")
   include_directories(${QT_INCLUDES}) # TODO: Port away from this.
 
   if(CMAKE_VERSION VERSION_LESS 2.8.9)
     message(FATAL_ERROR "Akonadi Qt 5 build requires at least CMake version 2.8.9")
   endif()
 
   if (Qt5_POSITION_INDEPENDENT_CODE)
     set(CMAKE_POSITION_INDEPENDENT_CODE ON)
   endif()
 
   set(QT_QTTEST_LIBRARIES Qt5::Test)
 else()
   set(QT_USE_IMPORTED_TARGETS TRUE) # Qt 4 only
-  #TODO figure out the exact minimum version so we can still build on Centos 6
-  #set(QT_MIN_VERSION 4.7.0)         # Qt 4 only
+  set(QT_MIN_VERSION 4.6.2)         # Qt 4 only
 
   find_package(Qt4 REQUIRED)
 endif()
 
 
 add_definitions(-DTEST_DATA_PATH="${CMAKE_CURRENT_SOURCE_DIR}")
 
 include_directories( ${CMAKE_CURRENT_SOURCE_DIR}/.. )
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 include_directories(${QT_INCLUDES} ${QT_INCLUDE_DIR} QtCore)
 if (NOT APPLE)
     set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wl,--no-undefined" ) 
 endif()
 
 if(PHP_BINDINGS)
     add_test(phptest php -d enable_dl=On -d include_path='.:/usr/share/pear:${CMAKE_BINARY_DIR}/src/php' -d extension=${CMAKE_BINARY_DIR}/src/php/kolabformat.so ${CMAKE_SOURCE_DIR}/src/php/test.php --verbose)
 endif()
 
 if (QT4_FOUND OR Qt5Core_FOUND)
     if (Qt5Core_FOUND)
       set(CMAKE_AUTOMOC ON)
       set(CMAKE_INCLUDE_CURRENT_DIR ON)
     endif()
 
     message("Buildings tests")
     if (QT4_FOUND)
       QT4_AUTOMOC(bindingstest.cpp)
       QT4_AUTOMOC(conversiontest.cpp)
       QT4_AUTOMOC(parsingtest.cpp)
       QT4_AUTOMOC(validationtest.cpp)
       QT4_AUTOMOC(kolabconversationtest.cpp)
      endif()
 
     add_executable(bindingstest bindingstest.cpp ${CMAKE_CURRENT_BINARY_DIR}/${BINDINGSTEST_MOC})
     target_link_libraries(bindingstest ${QT_QTTEST_LIBRARY} ${QT_QTCORE_LIBRARY} kolabxml ${XERCES_C})
     add_test(bindingstest ${CMAKE_CURRENT_BINARY_DIR}/bindingstest)
 
     add_executable(conversiontest conversiontest.cpp ${CMAKE_CURRENT_BINARY_DIR}/${CONVERSIONTEST_MOC})
     target_link_libraries(conversiontest ${QT_QTTEST_LIBRARY} ${QT_QTCORE_LIBRARY} kolabxml ${XERCES_C})
     add_test(conversiontest ${CMAKE_CURRENT_BINARY_DIR}/conversiontest)
 
     add_executable(parsingtest parsingtest.cpp ${CMAKE_CURRENT_BINARY_DIR}/${PARSINGTEST_MOC})
     target_link_libraries(parsingtest ${QT_QTTEST_LIBRARY} ${QT_QTCORE_LIBRARY} kolabxml ${XERCES_C})
     add_test(parsingtest ${CMAKE_CURRENT_BINARY_DIR}/parsingtest)
 
     add_executable(validationtest validationtest.cpp ${CMAKE_CURRENT_BINARY_DIR}/${VALIDATIONTEST_MOC})
     target_link_libraries(validationtest ${QT_QTTEST_LIBRARY} ${QT_QTCORE_LIBRARY} kolabxml ${XERCES_C})
     add_test(validationtest ${CMAKE_CURRENT_BINARY_DIR}/validationtest)
 
     add_executable(kolabconversationtest kolabconversationtest.cpp ${CMAKE_CURRENT_BINARY_DIR}/${KOLABCONVERSATIONTEST_MOC})
     target_link_libraries(kolabconversationtest ${QT_QTTEST_LIBRARY} ${QT_QTCORE_LIBRARY} kolabxml ${XERCES_C})
     add_test(kolabconversationtest ${CMAKE_CURRENT_BINARY_DIR}/kolabconversationtest)
 else()
     message(WARNING "Could not build tests because qt is missing")
 endif()