+#ifndef HAVE_LOCALTIME_R
+extern privoxy_mutex_t localtime_mutex;
+#endif /* ndef HAVE_GMTIME_R */
+
+#if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
+extern privoxy_mutex_t resolver_mutex;
+#endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
+
+#ifndef HAVE_RANDOM
+extern privoxy_mutex_t rand_mutex;
+#endif /* ndef HAVE_RANDOM */
+
+#endif /* FEATURE_PTHREAD */