We must include wx/dlimpexp.h from wx/debug.h to be able to forward declare wxString and wxCStrData using WXDLLIMPEXP_FWD_BASE, otherwise compilation errors occur in the code which includes wx/debug.h as the first wx header. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63758 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775