--- D:\projects\boost_root\boost\boost\signals\trackable.hpp	2003-02-12 12:46:59.000000000 -0600
+++ trackable.hpp	2003-02-13 23:40:51.000000000 -0600
@@ -30,7 +30,7 @@
   // Base class for "trackable" objects that can be tracked when they are
   // bound in slot target functions. When a trackable object is destroyed,
   // the signal/slot connections are disconnected automatically.
-  class trackable {
+  class BOOST_SIGNALS_DECL trackable {
   private:
     static void signal_disconnected(void* obj, void* data);