Berkley db error.

Hi

I have taken the openldap 2.4.11 version.My berkley db is 4.5.20 version.When am running the configure--enable-backends script its telling like

checking for db.h... yes checking for Berkeley DB major version... 4 checking for Berkeley DB minor version... 5 checking for Berkeley DB link (-ldb-4.5)... yes checking for Berkeley DB version match... no configure: error: Berkeley DB version mismatch

But have checked the configure script ,and its allowing berkley version major >=4 and minor >=2 .Can anyone explain then why am getting this error.Its urgent.

Regards Indranil