added dependency for correct build-order

CMakeLists.txt

@@ -51,6 +51,8 @@ add_executable(turtlesim_node ${turtlesim_node_SRCS} ${turtlesim_node_MOCS})
 target_link_libraries(turtlesim_node Qt5::Widgets ${catkin_LIBRARIES} ${Boost_LIBRARIES})
 #add_dependencies(turtlesim_node turtlesim_gencpp)
 
+add_dependencies(turtlesim_node turtlesim_xl_generate_messages)
+
 add_executable(turtle_teleop_key tutorials/teleop_turtle_key.cpp)
 target_link_libraries(turtle_teleop_key ${catkin_LIBRARIES})
 #add_dependencies(turtle_teleop_key turtlesim_gencpp)