int mutt_messages_in_thread (CONTEXT *, HEADER *, int);
-HASH *mutt_make_id_hash (CONTEXT *);
-HASH *mutt_make_subj_hash (CONTEXT *);
+hash_t *mutt_make_id_hash (CONTEXT *);
+hash_t *mutt_make_subj_hash (CONTEXT *);
int mutt_link_threads (HEADER *, HEADER *, CONTEXT *);
void mutt_break_thread (HEADER *);