Index: quassel-0.12.2/CMakeLists.txt
===================================================================
--- quassel-0.12.2.orig/CMakeLists.txt
+++ quassel-0.12.2/CMakeLists.txt
@@ -484,6 +484,8 @@ 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})
 check_cxx_source_compiles("
     #include \"qglobal.h\"
     #if defined QT_NO_OPENSSL || defined QT_NO_SSL