\subsection{GUI system}\label{guisystemconst}
\begin{twocollist}\itemsep=0pt
-\twocolitem{\_\_WINDOWS\_\_}{any Windows, yom may also use \_\_WXMSW\_\_}
+\twocolitem{\_\_WINDOWS\_\_}{any Windows, you may also use \_\_WXMSW\_\_}
\twocolitem{\_\_WIN16\_\_}{Win16 API (not supported since wxWidgets 2.6)}
\twocolitem{\_\_WIN32\_\_}{Win32 API}
\twocolitem{\_\_WXBASE\_\_}{Only wxBase, no GUI features (same as \texttt{wxUSE\_GUI} $== 0$)}
\twocolitem{\_\_WXCOCOA\_\_}{OS X using Cocoa API}
+\twocolitem{\_\_WXDFB\_\_}{wxUniversal using DirectFB}
\twocolitem{\_\_WXWINCE\_\_}{Windows CE}
\twocolitem{\_\_WXGTK\_\_}{GTK+}
\twocolitem{\_\_WXGTK12\_\_}{GTK+ 1.2 or higher}
\twocolitem{\_\_WXGTK20\_\_}{GTK+ 2.0 or higher}
+\twocolitem{\_\_WXGTK24\_\_}{GTK+ 2.4 or higher}
+\twocolitem{\_\_WXGTK26\_\_}{GTK+ 2.6 or higher}
+\twocolitem{\_\_WXGTK210\_\_}{GTK+ 2.10 or higher}
\twocolitem{\_\_WXMOTIF\_\_}{Motif}
\twocolitem{\_\_WXMOTIF20\_\_}{Motif 2.0 or higher}
\twocolitem{\_\_WXMAC\_\_}{Mac OS all targets}