+int key_compare (const void *p1, const void *p2);
+int key_compare_x (const struct it_key *i1, const struct it_key *i2);
+void key_input (const char *dict_fname, const char *isam_fname,
+ const char *key_fname, int cache);
+int key_sort (const char *key_fname, size_t mem);
+
+#define FNAME_WORD_DICT "worddict"
+#define FNAME_WORD_ISAM "wordisam"
+#define FNAME_FILE_DICT "filedict"
+#define FNAME_SYS_IDX "sysidx"
+#define SYS_IDX_ENTRY_LEN 120