diff --git a/cfg/wxwidgets.cfg b/cfg/wxwidgets.cfg
index e200491e9..2b8714c69 100644
--- a/cfg/wxwidgets.cfg
+++ b/cfg/wxwidgets.cfg
@@ -1701,7 +1701,10 @@
     </arg>
   </function>
   <define name="wxOVERRIDE" value="override"/>
+  <define name="wxEXPLICIT" value="explicit"/>
+  <define name="WXSIZEOF(array)" value="(sizeof(array)/sizeof(array[0]))"/>
   <define name="DECLARE_EVENT_TABLE()" value="wxDECLARE_EVENT_TABLE()"/>
+  <define name="wxNO_LEN" value="((size_t)-1)"/>
   <define name="wxDECLARE_EVENT_TABLE()" value="private: static const wxEventTableEntry sm_eventTableEntries[]; protected: const wxEventTable* GetEventTable() const; wxEventHashTable&amp; GetEventHashTable() const; static const wxEventTable sm_eventTable; static wxEventHashTable sm_eventHashTable;"/>
   <define name="wxIMPLEMENT_APP(appname)" value="wxIMPLEMENT_WX_THEME_SUPPORT wxIMPLEMENT_APP_NO_THEMES(appname)"/>
   <define name="wxIMPLEMENT_WX_THEME_SUPPORT" value=""/>