+\twocolitem{WXMAKINGDLL\_XXX}{used internally and defined when building the
+library \texttt{XXX} as a DLL; when a monolithic wxWidgets build is used only a
+single \texttt{WXMAKINGDLL} symbol is defined}
+\twocolitem{WXUSINGDLL}{defined when compiling code which uses wxWidgets as a
+DLL/shared library}
+\twocolitem{WXBUILDING}{defined when building wxWidgets itself, whether as a
+static or shared library}