--- hash.h.orig	2020-07-04 10:20:48.099418874 +0200
+++ hash.h	2020-07-04 10:21:37.279976514 +0200
@@ -128,11 +128,15 @@
  * Allocation and clean-up.
  */
 
+#if 0
+
 /* Return a hash index for a NUL-terminated STRING between 0 and N_BUCKETS-1.
    This is a convenience routine for constructing other hashing functions.  */
 extern size_t hash_string (const char *string, size_t n_buckets)
        _GL_ATTRIBUTE_PURE;
 
+#endif
+
 extern void hash_reset_tuning (Hash_tuning *tuning);
 
 typedef size_t (*Hash_hasher) (const void *entry, size_t table_size);