Hi Clément,
I use redhat6 and I stay a bit uncertain between using
ltb and redhat packages for openldap.
Here is the current situation proposed on redhat :
# cat /etc/issue
Red Hat Enterprise Linux Server release 6.4 (Santiago)
# rpm -qa | grep -i db4
db4-utils-4.7.25-17.el6.x86_64
db4-4.7.25-17.el6.x86_64
# rpm -qa | grep -i openldap
openldap-clients-2.4.23-32.el6_4.x86_64
openldap-debuginfo-2.4.23-15.el6_1.1.x86_64
openldap-2.4.23-32.el6_4.x86_64
openldap-servers-2.4.23-32.el6_4.x86_64
On the other hand, I would loose RedHat support in case of trouble.