// from pngerror.c
// so that the libpng doesn't send anything on stderr
void
-PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message)
+PNGLINKAGEMODE wx_png_error(png_structp WXUNUSED(png_ptr), png_const_charp message)
{
wxLogFatalError( wxString::FromAscii(message) );
}