--- hash.c.orig	2020-07-04 10:21:00.491559357 +0200
+++ hash.c	2020-07-04 10:22:00.536240305 +0200
@@ -390,6 +390,8 @@
 
 /* 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.  */
 
@@ -437,6 +439,8 @@
 
 #endif /* not USE_DIFF_HASH */
 
+#endif
+
 /* Return true if CANDIDATE is a prime number.  CANDIDATE should be an odd
    number at least equal to 11.  */