When I try to install openldap and find the following problem:

[root@crane openldap-2.2.24]# ./configure
Copyright 1998-2005 The OpenLDAP Foundation. All rights reserved.
Restrictions apply, see COPYRIGHT and LICENSE files.
Configuring OpenLDAP 2.2.24-Release ...
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking build system type... i686-pc-linux-gnu
checking for a BSD compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for mawk... no
............

checking for db.h... yes
checking for Berkeley DB link (default)... no
checking for Berkeley DB link (-ldb43)... no
checking for Berkeley DB link (-ldb-43)... no
checking for Berkeley DB link (-ldb-4.3)... no
checking for Berkeley DB link (-ldb-4-3)... no
checking for Berkeley DB link (-ldb42)... no
checking for Berkeley DB link (-ldb-42)... no
checking for Berkeley DB link (-ldb-4.2)... no
checking for Berkeley DB link (-ldb-4-2)... no
checking for Berkeley DB link (-ldb-4)... no
checking for Berkeley DB link (-ldb4)... no
checking for Berkeley DB link (-ldb)... yes
checking for Berkeley DB version match... yes
checking for Berkeley DB thread support... yes
checking Berkeley DB version for BDB backend... no
configure: error: BDB/HDB: BerkeleyDB version incompatible

Anyone can kindly point out what to do next?
Thanks in advance.

it looks for libdb-4.2 and doesn't find it but does find just libdb
that must be a link yes named libdb.so but what is it pointing to ?
show us
ls -l /usr/lib | grep libdb

-rwxr-xr-x 1 root root 55064 Jun 9 2003 libdb1.so.2
-rw-r--r-- 1 root root 1065480 Aug 21 2003 libdb-4.1.a
-rw-r--r-- 1 root root 714 Aug 21 2003 libdb-4.1.la
lrwxr-xr-x 1 root root 22 Apr 11 19:27 libdb-4.1.so -> ../../lib/libdb-4.1.so
-rwxr-xr-x 1 root root 532336 Aug 21 2003 libdb_cxx-3.1.so
-rwxr-xr-x 1 root root 722704 Aug 21 2003 libdb_cxx-3.2.so
-rwxr-xr-x 1 root root 631056 Aug 21 2003 libdb_cxx-3.3.so
-rwxr-xr-x 1 root root 736404 Aug 21 2003 libdb_cxx-4.0.so
-rw-r--r-- 1 root root 1159038 Aug 21 2003 libdb_cxx-4.1.a
-rw-r--r-- 1 root root 732 Aug 21 2003 libdb_cxx-4.1.la
-rwxr-xr-x 1 root root 860532 Aug 21 2003 libdb_cxx-4.1.so
lrwxr-xr-x 1 root root 16 Apr 11 19:42 libdb_cxx.so -> libdb_cxx-4.1.so
lrwxr-xr-x 1 root root 15 Apr 11 19:50 libdbi.so.0 -> libdbi.so.0.0.4
-rwxr-xr-x 1 root root 39784 Jan 31 2003 libdbi.so.0.0.4
lrwxr-xr-x 1 root root 22 Apr 11 19:42 libdb.so -> ../../lib/libdb-4.1.so
lrwxr-xr-x 1 root root 11 Apr 11 19:46 libdb.so.2 -> libdb1.so.2
-rwxr-xr-x 1 root root 573016 Aug 21 2003 libdb_tcl-3.1.so
-rwxr-xr-x 1 root root 774104 Aug 21 2003 libdb_tcl-3.2.so
-rwxr-xr-x 1 root root 676248 Aug 21 2003 libdb_tcl-3.3.so
-rwxr-xr-x 1 root root 781316 Aug 21 2003 libdb_tcl-4.0.so
-rw-r--r-- 1 root root 1228656 Aug 21 2003 libdb_tcl-4.1.a
-rw-r--r-- 1 root root 732 Aug 21 2003 libdb_tcl-4.1.la
-rwxr-xr-x 1 root root 911672 Aug 21 2003 libdb_tcl-4.1.so
lrwxr-xr-x 1 root root 16 Apr 11 19:42 libdb_tcl.so -> libdb_tcl-4.1.so

Thank you foo_bar_foo for your kind suggest. I finally installed the 4.2.52 and copied db.h to /usr/include, and all new libdbs to /usr/lib. That fixed the problem.