Put the variable only used in wxGTK inside "#ifdef __WXGTK__". This fixes the warning but the real fix would be to get rid of this variable completely and just fix whatever problem in wxWindow::Navigate() this was supposed to work around. See #14459. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775