-extern SCM scm_hashq_get_handle SCM_P ((SCM table, SCM obj));
-extern SCM scm_hashq_create_handle_x SCM_P ((SCM table, SCM obj, SCM init));
-extern SCM scm_hashq_ref SCM_P ((SCM table, SCM obj, SCM dflt));
-extern SCM scm_hashq_set_x SCM_P ((SCM table, SCM obj, SCM val));
-extern SCM scm_hashq_remove_x SCM_P ((SCM table, SCM obj));
-extern SCM scm_hashv_get_handle SCM_P ((SCM table, SCM obj));
-extern SCM scm_hashv_create_handle_x SCM_P ((SCM table, SCM obj, SCM init));
-extern SCM scm_hashv_ref SCM_P ((SCM table, SCM obj, SCM dflt));
-extern SCM scm_hashv_set_x SCM_P ((SCM table, SCM obj, SCM val));
-extern SCM scm_hashv_remove_x SCM_P ((SCM table, SCM obj));
-extern SCM scm_hash_get_handle SCM_P ((SCM table, SCM obj));
-extern SCM scm_hash_create_handle_x SCM_P ((SCM table, SCM obj, SCM init));
-extern SCM scm_hash_ref SCM_P ((SCM table, SCM obj, SCM dflt));
-extern SCM scm_hash_set_x SCM_P ((SCM table, SCM obj, SCM val));
-extern SCM scm_hash_remove_x SCM_P ((SCM table, SCM obj));
-extern SCM scm_hashx_get_handle SCM_P ((SCM hash, SCM assoc, SCM table, SCM obj));
-extern SCM scm_hashx_create_handle_x SCM_P ((SCM hash, SCM assoc, SCM table, SCM obj, SCM init));
-extern SCM scm_hashx_ref SCM_P ((SCM hash, SCM assoc, SCM table, SCM obj, SCM dflt));
-extern SCM scm_hashx_set_x SCM_P ((SCM hash, SCM assoc, SCM table, SCM obj, SCM val));
-extern SCM scm_hashx_remove_x SCM_P ((SCM hash, SCM assoc, SCM del, SCM table, SCM obj));
-extern void scm_init_hashtab SCM_P ((void));
+extern SCM scm_hashq_get_handle (SCM table, SCM obj);
+extern SCM scm_hashq_create_handle_x (SCM table, SCM obj, SCM init);
+extern SCM scm_hashq_ref (SCM table, SCM obj, SCM dflt);
+extern SCM scm_hashq_set_x (SCM table, SCM obj, SCM val);
+extern SCM scm_hashq_remove_x (SCM table, SCM obj);
+extern SCM scm_hashv_get_handle (SCM table, SCM obj);
+extern SCM scm_hashv_create_handle_x (SCM table, SCM obj, SCM init);
+extern SCM scm_hashv_ref (SCM table, SCM obj, SCM dflt);
+extern SCM scm_hashv_set_x (SCM table, SCM obj, SCM val);
+extern SCM scm_hashv_remove_x (SCM table, SCM obj);
+extern SCM scm_hash_get_handle (SCM table, SCM obj);
+extern SCM scm_hash_create_handle_x (SCM table, SCM obj, SCM init);
+extern SCM scm_hash_ref (SCM table, SCM obj, SCM dflt);
+extern SCM scm_hash_set_x (SCM table, SCM obj, SCM val);
+extern SCM scm_hash_remove_x (SCM table, SCM obj);
+extern SCM scm_hashx_get_handle (SCM hash, SCM assoc, SCM table, SCM obj);
+extern SCM scm_hashx_create_handle_x (SCM hash, SCM assoc, SCM table, SCM obj, SCM init);
+extern SCM scm_hashx_ref (SCM hash, SCM assoc, SCM table, SCM obj, SCM dflt);
+extern SCM scm_hashx_set_x (SCM hash, SCM assoc, SCM table, SCM obj, SCM val);
+extern SCM scm_hashx_remove_x (SCM hash, SCM assoc, SCM del, SCM table, SCM obj);
+extern SCM scm_hash_fold (SCM proc, SCM init, SCM hash);
+extern void scm_init_hashtab (void);