-int _ltt_trace_setup(const char *trace_name);
-int ltt_trace_setup(const char *trace_name);
-struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name);
-int ltt_trace_set_type(const char *trace_name, const char *trace_type);
-int ltt_trace_set_channel_subbufsize(const char *trace_name,
+extern int _ltt_trace_setup(const char *trace_name);
+extern int ltt_trace_setup(const char *trace_name);
+extern struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name);
+extern int ltt_trace_set_type(const char *trace_name, const char *trace_type);
+extern int ltt_trace_set_channel_subbufsize(const char *trace_name,