add_subdirectory(./NBCore)
add_subdirectory(./NBEvents)
add_subdirectory(./NBGraphics)

if (NB_CORE_SOURCE OR NB_EVENTS_SOURCE OR NB_GRAPHICS_SOURCE)
    set(NB_SOURCE_FILES "")
    list(APPEND NB_SOURCE_FILES ${NB_CORE_SOURCE} ${NB_GRAPHICS_SOURCE} ${NB_EVENTS_SOURCE})
    set(NB_SOURCE_FILES ${NB_SOURCE_FILES} PARENT_SCOPE)
endif()


if (NB_CORE_INCLUDE OR NB_EVENTS_INCLUDE OR NB_GRAPHICS_INCLUDE)
    set(NB_INCLUDE_FILES "")
    list(APPEND NB_INCLUDE_FILES ${NB_CORE_INCLUDE} ${NB_GRAPHICS_INCLUDE} ${NB_EVENTS_INCLUDE})
    set(NB_INCLUDE_FILES ${NB_INCLUDE_FILES} PARENT_SCOPE)
endif()
message("${NB_INCLUDE_FILES}")