extern int find_objc_msgcall (CORE_ADDR pc, CORE_ADDR *new_pc);
-extern char *find_imps (char *method, VEC (const_char_ptr) **symbol_names);
+extern const char *
+ find_imps (const char *method, VEC (const_char_ptr) **symbol_names);
extern struct value *value_nsstring (struct gdbarch *gdbarch,
char *ptr, int len);