-template<typename T> std::list<PBD::thing_with_backtrace<T> *> PBD::thing_with_backtrace<T>::all;
-template<typename T> Glib::Threads::Mutex PBD::thing_with_backtrace<T>::all_mutex;
+template<typename T> /*LIBPBD_API*/ std::list<PBD::thing_with_backtrace<T> *> PBD::thing_with_backtrace<T>::all;
+template<typename T> /*LIBPBD_API*/ Glib::Threads::Mutex PBD::thing_with_backtrace<T>::all_mutex;