if(DD4HEP_USE_XERCESC)
  find_package( XercesC REQUIRED )
  add_definitions(-DDD4HEP_USE_XERCESC)
  include_directories(SYSTEM ${XERCESC_INCLUDE_DIRS})
  set(XML_LIBRARIES ${XERCESC_LIBRARIES})
else()
  add_definitions(-DDD4HEP_USE_TINYXML)
  set(XML_LIBRARIES)
endif()