In your openwrt source dir git my tree then run make menuconfig and choose iptables-mod-ndpi and kmod-ipt-ndpithen enable support for connlabel, after that save and exit then run make download V=s it will start to donwload the source after that you can run make package/ndpi-netfilter2/compile V=s .
I need to make a patch for MIPS Arch.