openldap-2.4.20 installation

Dear friends Today i tried to install openldap2.4.20 on RHEL 5.2. After firing ./configure script, i got following error

*Configure:error: Berkeley DB version incomptible with BDB/HDB backend.

*But after investigation i found that db4 with version 4.3.29 is installed on my system. So what i should do now, Should i replace my Berkeley DB package? I want to be sure that other running programs not get any issue after bdb upgradation. How one know which bdb version is required by current openldap package ?

thanks

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