-Wcast-qual and -Wwrite-strings warnings enabled,
                        which is now the default when using gcc.  (Warnings
                        from confparser.c, because of yacc's code, are
                        unfortunately to be expected.)

 223.   [func]          Several functions were reprototyped to qualify one
                        or more of their arguments with "const".  Similarly,
                        several functions that return pointers now have
                        those pointers qualified with const.