Index: quassel-0.12.5/CMakeLists.txt
===================================================================
--- quassel-0.12.5.orig/CMakeLists.txt
+++ quassel-0.12.5/CMakeLists.txt
@@ -465,6 +465,8 @@ endif()
 # a small test program checking the defines. This works for both Qt4 and Qt5.
 cmake_push_check_state(RESET)
 set(CMAKE_REQUIRED_INCLUDES ${QT_INCLUDES} ${Qt5Core_INCLUDE_DIRS})
+set(CMAKE_REQUIRED_FLAGS ${Qt5Core_EXECUTABLE_COMPILE_FLAGS})
+set(CMAKE_REQUIRED_LIBRARIES ${Qt5Core_LIBRARIES})
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Core_EXECUTABLE_COMPILE_FLAGS}")
 
 if (USE_QT5 AND Qt5_POSITION_INDEPENDENT_CODE)