-#define DEBUG(...) plugin_log (LOG_DEBUG, __VA_ARGS__)
-
-/* TODO: Move plugin_{complain,relief} into `utils_complain.[ch]'. -octo */
-void plugin_complain (int level, complain_t *c, const char *format, ...);
-void plugin_relief (int level, complain_t *c, const char *format, ...);
+#if COLLECT_DEBUG
+# define DEBUG(...) plugin_log (LOG_DEBUG, __VA_ARGS__)
+#else /* COLLECT_DEBUG */
+# define DEBUG(...) /* noop */
+#endif /* ! COLLECT_DEBUG */