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People trying to install libreswan from rhel-7.5 on rhel-7.4 are getting the error:

May 02 17:56:50 vel1-nfv02-kvm0401 addconn[538238]: /usr/libexec/ipsec/addconn: symbol lookup error: /usr/libexec/ipsec/addconn: undefined symbol: ub_ctx_create_event
May 02 17:56:50 vel1-nfv02-kvm0401 systemd[1]: ipsec.service: control process exited, code=exited status=127
May 02 17:56:50 vel1-nfv02-kvm0401 systemd[1]: Failed to start Internet Key Exchange (IKE) Protocol Daemon for IPsec. -- Subject: Unit ipsec.service has failed

Just to clarify, we just need to add:

Requires: unbound-libs >= 1.6.6

The spec file already contains:

BuildRequires: unbound-devel >= 1.6.6

Successfully verified:

# yum localinstall http://download.eng.bos.redhat.com/brewroot/packages/libreswan/3.25/2.el7/x86_64/libreswan-3.25-2.el7.x86_64.rpm

Dependencies Resolved

=====================================================================
 Package       Arch   Version      Repository                   Size
=====================================================================
Installing:
 libreswan    x86_64  3.25-2.el7  /libreswan-3.25-2.el7.x86_64 4.7 M
Installing for dependencies:
 unbound-libs x86_64  1.6.6-1.el7 rhel                         405 k

Transaction Summary
=====================================================================
Install  1 Package (+1 Dependent package)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:3174