+if(FORCE_QT4)
+ set(Qt5Core_FOUND FALSE)
+else()
+ find_package(Qt5Core QUIET)
+endif()
+
+if(Qt5Core_FOUND)
+ message("-- Using Qt5")
+ find_package(Qt5Widgets REQUIRED)
+ find_package(Qt5Gui REQUIRED)
+ find_package(Qt5Svg REQUIRED)
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
+ set(QT_INCLUDE_DIRS ${Qt5Gui_INCLUDE_DIRS} ${Qt5Widgets_INCLUDE_DIRS})
+ set(QT_LIBRARIES Qt5::Gui Qt5::Widgets Qt5::Svg)
+ add_definitions(${Qt5Gui_DEFINITIONS} ${Qt5Widgets_DEFINITIONS})
+else()
+ find_program(QT_QMAKE_EXECUTABLE NAMES qmake4 qmake-qt4 qmake-mac)
+ find_package(Qt4 REQUIRED QtCore QtGui QtSvg)
+endif()
+
+if(ENABLE_TESTS)
+ find_package(Boost 1.53 COMPONENTS filesystem system thread unit_test_framework REQUIRED)
+else()
+ find_package(Boost 1.53 COMPONENTS filesystem system thread REQUIRED)
+endif()
+
+# Find the platform's thread library (needed for C++11 threads).
+# This will set ${CMAKE_THREAD_LIBS_INIT} to the correct, OS-specific value.
+find_package(Threads REQUIRED)
+
+#===============================================================================
+#= System Introspection
+#-------------------------------------------------------------------------------