FedoraDS ldapserver install, per ldapserver/m4/db.m4, looks for db.h version info,

	dnl figure out which version of db we're using from the header file
	db_ver_maj=`grep DB_VERSION_MAJOR $db_incdir/db.h | awk '{print $3}'`
	db_ver_min=`grep DB_VERSION_MINOR $db_incdir/db.h | awk '{print $3}'`
	db_ver_pat=`grep DB_VERSION_PATCH $db_incdir/db.h | awk '{print $3}'`

first in,

	/usr/include/db.h

with a simple "file exists?" check.

problem on opensuse11 is,

	rpm -qa | grep -i libdb
		libdb-4_5-4.5.20-67.1
		libdb-4_5-32bit-4.5.20-67.1
		libdb-4_5-devel-4.5.20-67.1

	ls -1d /usr/include/db*
		/usr/include/db_185.h
		/usr/include/db4/
		/usr/include/db.h

	ls -al /usr/include/db4/
		-r--r--r--  1 root root   6025 2008-06-06 13:35 db_185.h
		-r--r--r--  1 root root 101993 2008-06-06 13:35 db.h

	cat /usr/include/db.h
		#include <db4/db.h>

the req'd info is not there, causing a config fail.  instead it's in the referenced <db4/db.h>, which is *not* searched at all.  i.e.,

	head -10 /usr/include/db4/db.h
		/*
		 * See the file LICENSE for redistribution information.
		 *
		 * Copyright (c) 1996-2006
		 *	Oracle Corporation.  All rights reserved.
		 *
		 * $Id: db.in,v 12.108 2006/09/13 14:53:37 mjc Exp $
		 *
		 * db.h include file layout:
		 *	General.

	grep DB_VERSION_MAJOR /usr/include/db4/db.h | awk '{print $3}'
		4

etc.

a quick & dirty hack,

vi db.m4.patch
--- db.m4.ORIG	2008-08-25 11:55:16.000000000 -0700
+++ db.m4	2008-08-25 12:08:46.000000000 -0700
@@ -55,19 +55,19 @@
 dnl default path for the db tools (see [210947] for more details)
 
 dnl - check in system locations
-if test -z "$db_inc"; then
+dnl if test -z "$db_inc"; then
   AC_MSG_CHECKING(for db.h)
-  if test -f "/usr/include/db.h"; then
-    AC_MSG_RESULT([using /usr/include/db.h])
-    db_incdir="/usr/include"
-    db_inc="-I/usr/include"
+  if test -f "/usr/include/db4/db.h"; then
+    AC_MSG_RESULT([using /usr/include/db4/db.h])
+    db_incdir="/usr/include/db4"
+    db_inc="-I/usr/include/db4"
     db_lib='-L$(libdir)'
     db_libdir='$(libdir)'
   else
     AC_MSG_RESULT(no)
     AC_MSG_ERROR([db not found, specify with --with-db.])
   fi
-fi
+dnl fi
 dnl figure out which version of db we're using from the header file
 db_ver_maj=`grep DB_VERSION_MAJOR $db_incdir/db.h | awk '{print $3}'`
 db_ver_min=`grep DB_VERSION_MINOR $db_incdir/db.h | awk '{print $3}'`

cd ldapserver/m4
patch -p0 < db.m4.patch

circumvents -- rahter than fixes -- the problem.