Oops, my system has migrated underneath of me to BSD DB 2.*
from SleepyCat, and of course I copied over code from  bsdbtree.c,
where that  BINFO  block is defined..  /Matti Aarnio

Index: router/libdb/bsdhash.c
===================================================================
RCS file: /home/mea/src/CVSROOT/zmailer/router/libdb/bsdhash.c,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -r1.7 -r1.8
--- router/libdb/bsdhash.c	1999/06/06 20:13:59	1.7
+++ router/libdb/bsdhash.c	1999/06/07 05:26:10	1.8
@@ -87,7 +87,7 @@
 				DB_CREATE |((flag == O_RDONLY) ? DB_RDONLY:0),
 				0644, NULL, NULL, &db);
 #else
-		  db = dbopen(sip->file, flag, 0, DB_HASH, &BINFO);
+		  db = dbopen(sip->file, flag, 0, DB_HASH, NULL);
 #endif
 		  if (db != NULL)
 		    break;