--- hash.c.orig	2020-07-04 10:21:00.491559357 +0200
+++ hash.c	2020-07-04 10:22:00.536240305 +0200
@@ -345,6 +345,8 @@
 
 /* Allocation and clean-up.  */
 
+#if 0
+
 #if USE_DIFF_HASH
 
 /* About hashings, Paul Eggert writes to me (FP), on 1994-01-01: "Please see
@@ -389,6 +391,8 @@
 
 #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.  */