-void ltt_channels_trace_free(struct ltt_channel_struct *channels);
-int _ltt_channels_get_event_id(const char *channel, const char *name);
-int ltt_channels_get_event_id(const char *channel, const char *name);
+extern void ltt_channels_trace_free(struct ust_channel *channels);
+extern int _ltt_channels_get_event_id(const char *channel, const char *name);
+extern int ltt_channels_get_event_id(const char *channel, const char *name);