/usr/include/dpdk/rte_rtm.h is in libdpdk-dev 17.11.1-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/dpdk/../x86_64-linux-gnu/dpdk/rte_rtm.h
/usr/include/dpdk/../x86_64-linux-gnu/dpdk/rte_rtm.h