message: prefer CMAKE_INSTALL_INCLUDEDIR
diff: @@ -163,11 +163,11 @@ install(TARGETS ${LIBRARY_TARGET_NAME}
  )
  install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/${PROJECT_NAME}" # src
  - DESTINATION "include" # target directory
  + DESTINATION ${CMAKE_INSTALL_INCLUDEDIR} # target directory
  COMPONENT dev
  )
  install(FILES ${EXPORT_MACRO_FILE}
  - DESTINATION "include/${PROJECT_NAME}"
  + DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}"
  COMPONENT dev
  )
  