--- mariadb/libmysql/client_plugin.c	2013-03-06 17:06:42.548905989 +0100
+++ mariadb/libmysql/client_plugin.c	2013-03-06 17:14:29.721588964 +0100
@@ -175,7 +175,9 @@
     goto err2;
   }
 
+#ifdef THREAD
   safe_mutex_assert_owner(&LOCK_load_client_plugin);
+#endif
 
   p->next= plugin_list[plugin->type];
   plugin_list[plugin->type]= p;