+char *roff_strdup(const struct roff *, const char *);
+int roff_getcontrol(const struct roff *,
+ const char *, int *);
+#if 0
+char roff_eqndelim(const struct roff *);
+void roff_openeqn(struct roff *, const char *,
+ int, int, const char *);
+int roff_closeeqn(struct roff *);
+#endif