The return value is the malloced name of a header to try and open,
if any, or NULL otherwise. This callback is called only if the
header is otherwise unfound. */
-typedef const char *(*missing_header_cb)(cpp_reader *, const char *header);
+typedef const char *(*missing_header_cb)(cpp_reader *, const char *header, cpp_dir **);
/* Call backs to cpplib client. */
struct cpp_callbacks
extern bool cpp_push_include (cpp_reader *, const char *);
extern void cpp_change_file (cpp_reader *, enum lc_reason, const char *);
extern const char *cpp_get_path (struct _cpp_file *);
+extern cpp_dir *cpp_get_dir (struct _cpp_file *);
extern cpp_buffer *cpp_get_buffer (cpp_reader *);
extern struct _cpp_file *cpp_get_file (cpp_buffer *);
extern cpp_buffer *cpp_get_prev (cpp_buffer *);