-// symbolic constant used by all Find()-like functions returning positive
-// integer on success as failure indicator
-#define wxNOT_FOUND (-1)
+#ifdef WXMAKINGDLL_HTML
+ #define WXDLLIMPEXP_HTML WXEXPORT
+ #define WXDLLIMPEXP_DATA_HTML(type) WXEXPORT type
+#elif defined(WXUSINGDLL)
+ #define WXDLLIMPEXP_HTML WXIMPORT
+ #define WXDLLIMPEXP_DATA_HTML(type) WXIMPORT type
+#else // not making nor using DLL
+ #define WXDLLIMPEXP_HTML
+ #define WXDLLIMPEXP_DATA_HTML(type) type
+#endif
+
+#ifdef WXMAKINGDLL_GL
+ #define WXDLLIMPEXP_GL WXEXPORT
+#elif defined(WXUSINGDLL)
+ #define WXDLLIMPEXP_GL WXIMPORT
+#else // not making nor using DLL
+ #define WXDLLIMPEXP_GL
+#endif
+
+#ifdef WXMAKINGDLL_XML
+ #define WXDLLIMPEXP_XML WXEXPORT
+#elif defined(WXUSINGDLL)
+ #define WXDLLIMPEXP_XML WXIMPORT
+#else // not making nor using DLL
+ #define WXDLLIMPEXP_XML
+#endif
+
+// for backwards compatibility, define suffix-less versions too
+#define WXDLLEXPORT WXDLLIMPEXP_CORE
+#define WXDLLEXPORT_DATA WXDLLIMPEXP_DATA_CORE