Based on this post: https://n40lab.wordpress.com/2016/03/02/openvswitch-lts-in-centos-7 The most recent release from the LTS series: http://openvswitch.org/releases/openvswitch-2.5.4.tar.gz
Instructions:
As the root user let’s install some packages:
yum -y install wget openssl-devel gcc make python-devel openssl-devel kernel-devel graphviz kernel-debug-devel autoconf automake rpm-build redhat-rpm-config libtool python-twisted-core python-zope-interface PyQt4 desktop-file-utils libcap-ng-devel groff checkpolicy selinux-policy-devel