From Fedora Project Wiki
CentOS Cloud SIG ppc64le issues
The following is a list of open issues needed to get https://buildlogs.centos.org/centos/7/cloud/ppc64le/openstack-pike/ matching https://buildlogs.centos.org/centos/7/cloud/x86_64/openstack-pike/
libunwind
libunwind-1.1-3.el7.src.rpm does not support ppc64le architecture
... error: Architecture is not included: ppc64le ...
We need to tag libunwind-1.1-10.el7 into cloud7-openstack-common-release