/* The null or zero ptid, often used to indicate no process. */
-extern ptid_t null_ptid;
+extern const ptid_t null_ptid;
/* The (-1,0,0) ptid, often used to indicate either an error condition
or a "don't care" condition, i.e, "run all threads." */
-extern ptid_t minus_one_ptid;
+extern const ptid_t minus_one_ptid;
#endif /* COMMON_PTID_H */