extern SCM scm_ftell (SCM object);
extern SCM scm_redirect_port (SCM into_pt, SCM from_pt);
extern SCM scm_dup_to_fdes (SCM fd_or_port, SCM newfd);
extern SCM scm_ftell (SCM object);
extern SCM scm_redirect_port (SCM into_pt, SCM from_pt);
extern SCM scm_dup_to_fdes (SCM fd_or_port, SCM newfd);