darknet build with make failed

[GiorgioSgl]

I try to build darknet-nnpack after install nnpack trough this command cause ninja doesn't work

But when I try it failed, I think he doesn't found the nnpack or something like that

pi@raspberrypi:~/darknet-nnpack $ make
mkdir -p ./obj/
mkdir -p backup
mkdir -p results
chmod +x *.sh
g++ -std=c++11 -Iinclude/ -I3rdparty/stb/include -Wall -Wfatal-errors -Wno-unused-result -Wno-unknown-pragmas -fPIC -Ofast -DNNPACK -c ./src/image_opencv.cpp -o obj/image_opencv.o
In file included from ./src/image.h:3,
                 from ./src/image_opencv.h:4,
                 from ./src/image_opencv.cpp:1:
include/darknet.h:19:10: fatal error: nnpack.h: No such file or directory
 #include <nnpack.h>
          ^~~~~~~~~~
compilation terminated.
make: *** [Makefile:165: obj/image_opencv.o] Error 1

I'm trying it on RaspberryPI4, maybe I will test it also on my Ubuntu machine 20.04 and let you know if I got the same error