code: func (v *Clipboard) WaitForImage() (*gdk.Pixbuf, error) {
  	c := C.gtk_clipboard_wait_for_image(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	p := &gdk.Pixbuf{glib.Take(unsafe.Pointer(c))}
  	return p, nil
  }
docs: // WaitForImage is a wrapper around gtk_clipboard_wait_for_image