extern struct var *lookup_by_obj(lispobj obj);
extern struct var *define_var(char *name, lispobj obj, boolean perm);
extern struct var *define_dynamic_var(char *name,
extern struct var *lookup_by_obj(lispobj obj);
extern struct var *define_var(char *name, lispobj obj, boolean perm);
extern struct var *define_dynamic_var(char *name,
-extern long var_clock(struct var *var);
-extern void var_setclock(struct var *var, long value);
+extern sword_t var_clock(struct var *var);
+extern void var_setclock(struct var *var, sword_t value);