OpenLDAP 2.1.23 install on Slackware 9.1

[ro0ot <ro0ot@phreaker.net>]

Hi,

I have Slackware 9.1 running...but I had removed db1, db2, and db3
I installed BerkeleyDB 4.1.25 into the system (Slackware 9.1)
Now, I begin to install openldap-2.1.23.tar.gz on the Slackware 9.1 
system but failure

I run the following command below: -

tar xvfz openldap-2.1.23.tar.gz
cd openldap-2.1.23
env CPPFLAGS='-I/usr/local/BerkeleyDB.4.1/include -I/usr/local/include' 
LDFLAGS=-L/usr/local/BerkeleyDB.4.1/lib
./configure --enable-ldbm --with-tls=openssl --enable-wrappers

I got this error message below during configure: -

checking for db.h... yes
checking for Berkeley DB link (default)... no
checking for Berkeley DB link (-ldb41)... no
checking for Berkeley DB link (-ldb-41)... no
checking for Berkeley DB link (-ldb-4.1)... no
checking for Berkeley DB link (-ldb-4-1)... no
checking for Berkeley DB link (-ldb-4)... no
checking for Berkeley DB link (-ldb4)... no
checking for Berkeley DB link (-ldb)... no
checking for Berkeley DB link (-ldb3)... no
checking for Berkeley DB link (-ldb-3)... no
checking for Berkeley DB link (-ldb2)... no
checking for Berkeley DB link (-ldb-2)... no
checking for Berkeley DB link (-ldb1)... no
checking for Berkeley DB link (-ldb-1)... no
configure: error: BDB: BerkeleyDB not available

Regards,
ro0ot