Add Qt5 option. Use Qt5 by default.

externals/qhexedit/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(CMAKE_AUTOMOC ON)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 set(SRCS
             commands.cpp
@@ -10,6 +11,8 @@ set(HEADERS
             qhexedit.h
             qhexedit_p.h)
 
-include_directories(${CMAKE_CURRENT_BINARY_DIR})
-
 add_library(qhexedit STATIC ${SRCS} ${HEADERS})
+if(USE_QT5)
+    target_link_libraries(qhexedit Qt5::Core Qt5::Widgets)
+endif()
+