For details see log.do_compile.69664 in attachments.
Uninstall libxen-dev from your build host.
--enable-board=intel-xeon-core --enable-kernel=preempt-rt --enable-rootfs=ovp-kvm --enable-addons=wr-ovp --with-layer=/folk/xdong/wr-testing/ovp-benchmark --with-template=feature/rt-tune,feature/rt-tests make fs