[2.8.4 latest version] Including/compiling wxchar.h

[H]

When including wxchar.h in my own code on MAC OS X I get the following 
error message:

/Users/Hartwig/Documents/C++-Programme/PublicLibs/UILibs/wxWidgets/wxMac-
2.8.4/include/wx/wxchar.h:988: error: expected initializer before 
'ATTRIBUTE_PRINTF_3'

This is the critical code in wxchar.h:

#ifndef wxSnprintf_
    /* no snprintf(), cook our own */
    WXDLLIMPEXP_BASE int
    wxSnprintf_(wxChar *buf, size_t len, const wxChar *format, ...) 
ATTRIBUTE_PRINTF_3;
#endif

As I do not get any error compiling the widget library I think that 
somehow a compile parameter is wrong.
Does somebody know what might have gone wrong?

Hartwig