extern SCM scm_gettimeofday (void);
extern SCM scm_localtime (SCM time, SCM zone);
extern SCM scm_gmtime (SCM time);
extern SCM scm_mktime (SCM sbd_time, SCM zone);
extern SCM scm_tzset (void);
extern SCM scm_gettimeofday (void);
extern SCM scm_localtime (SCM time, SCM zone);
extern SCM scm_gmtime (SCM time);
extern SCM scm_mktime (SCM sbd_time, SCM zone);
extern SCM scm_tzset (void);