As per #595376 , after a Perl Upgrade, openldap needed to be rebuilt manually. No openldap ebuilds have a subslot dep for perl.
commit c5d27eccfd826095496729385dbedc246174d27b (HEAD -> master, origin/master, origin/HEAD) Author: Andreas K. Hüttel <dilfridge@gentoo.org> Date: Thu Sep 29 23:36:15 2016 +0200 net-nds/openldap: Add slot operator on Perl dependency where possible, bug 595388 Package-Manager: portage-2.3.0 net-nds/openldap/openldap-2.4.38-r2.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.39.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.40-r2.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.40-r4.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.40.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.42-r1.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.42.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.43-r1.ebuild | 2 +- net-nds/openldap/openldap-2.4.43.ebuild | 4 ++-- net-nds/openldap/openldap-2.4.44.ebuild | 2 +- 10 files changed, 18 insertions(+), 18 deletions(-)