def Define(self, name, value = None, comment = None):
        """
        Define a pre processor symbol name, with the optional given value in the
        current config header.

        If value is None (default), then #define name is written. If value is not
        none, then #define name value is written.

        comment is a string which will be put as a C comment in the header, to explain the meaning of the value
        (appropriate C comments will be added automatically).
        """
        lines = []
        if comment:
            comment_str = "/* %s */" % comment
            lines.append(comment_str)

        if value is not None:
            define_str = "#define %s %s" % (name, value)
        else:
            define_str = "#define %s" % name
        lines.append(define_str)
        lines.append('')

        self.config_h_text = self.config_h_text + '\n'.join(lines)
Define a pre processor symbol name, with the optional given value in the
        current config header.

        If value is None (default), then #define name is written. If value is not
        none, then #define name value is written.

        comment is a string which will be put as a C comment in the header, to explain the meaning of the value
        (appropriate C comments will be added automatically).