-#if defined(VMS) && !defined(__GNUC__)
-# define EXT globaldef {"$GLOBAL_RW_VARS"} noshare
-# define dEXT globaldef {"$GLOBAL_RW_VARS"} noshare
-#else
-# define EXT
-# define dEXT
-#endif
+#undef EXTCONST
+#undef dEXTCONST
+
+# if (defined(WIN32) && defined(__MINGW32__)) || defined(__SYMBIAN32__)
+# ifdef __cplusplus
+# define EXT __declspec(dllexport)
+# define dEXT
+# define EXTCONST __declspec(dllexport) extern const
+# define dEXTCONST const
+# else
+# define EXT __declspec(dllexport)
+# define dEXT
+# define EXTCONST __declspec(dllexport) const
+# define dEXTCONST const
+# endif
+# else
+# ifdef __cplusplus
+# define EXT
+# define dEXT
+# define EXTCONST EXTERN_C const
+# define dEXTCONST const
+# else
+# define EXT
+# define dEXT
+# define EXTCONST const
+# define dEXTCONST const
+# endif
+# endif