file(GLOB EXAMPLE_DIRS CONFIGURE_DEPENDS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/*)

foreach(dir ${EXAMPLE_DIRS})
  if(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${dir} AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${dir}/CMakeLists.txt)
    add_subdirectory(${dir})
  endif()
endforeach()