#ifdef XBT_LOG_LOCALLY_DEFINE_XBT_CHANNEL
XBT_LOG_NEW_CATEGORY(xbt, "All XBT categories (simgrid toolbox)");
+XBT_LOG_NEW_SUBCATEGORY(xbt_help, xbt, "Help messages");
#else
XBT_LOG_EXTERNAL_CATEGORY(xbt);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_help);
#endif
/** @addtogroup XBT_syscall