Changelog for kernel-preempt_rt4-firmware-4.9.9_rt6-3.1.x86_64.rpm :

* Thu Feb 16 2017 Rene.vanPaassenAATTgmail.com- update to kernel 4.9.9, rt6
* Thu Apr 21 2016 Rene.vanPaassenAATTgmail.com- need to add openssl-devel as build dependency