*/
int prompt(docstring const & title, docstring const & question,
int default_button, int cancel_button,
- docstring const & b1, docstring const & b2, docstring const & b3 = docstring());
+ docstring const & b1, docstring const & b2,
+ docstring const & b3 = docstring(),
+ docstring const & b4 = docstring());
/**
* Display a warning to the user. Title should be a short (general) summary.