conf_open
(void) conf_open(argv[1], argv[1], opts);
int conf_open(const char *cfname, const char *tfname, struct opts *opts);
status = conf_open(conffile, timestamps, clopts);
int conf_open(conf_t *, const char *, char *[]);
if (checkm4() != 0 || conf_open(&cf, "/usr/ccs/bin/m4", m4argv) == -1) {