This file is configured to configure ndpi with new dpdk (v21.08). after installing Dpdk and other software or prerequisities download the nDPI when Download the nDPI
Now Download this Makefile.dpdk.in file and replace with the Makefile.dpdk.in in the nDPI/example/
reference installtion of DPDK 21.08 is: https://hackmd.io/A-bXlGVcQguZm1VZuROctQ