#include "wx/string.h"
#include "wx/filefn.h" // for wxFileOffset, wxInvalidOffset and wxSeekMode
-class WXDLLIMPEXP_BASE wxStreamBase;
-class WXDLLIMPEXP_BASE wxInputStream;
-class WXDLLIMPEXP_BASE wxOutputStream;
+class WXDLLIMPEXP_FWD_BASE wxStreamBase;
+class WXDLLIMPEXP_FWD_BASE wxInputStream;
+class WXDLLIMPEXP_FWD_BASE wxOutputStream;
typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);