+XBT_LOG_EXTERNAL_CATEGORY(xbt);
+XBT_LOG_DEFAULT_CATEGORY(xbt);
+
+/**
+ * @brief Kill the program with an error message
+ * \param msg
+ *
+ * Things are so messed up that the only thing to do now, is to stop the program.
+ *
+ * The message is handled by a CRITICAL logging request
+ *
+ * If you want to pass arguments to the format, you can always write xbt_assert1(0,"fmt",args)
+ */