internal symbol `pthreadpool_deallocate' isn't defined erro during build

[KautzJ]

During the ninja build of NNPACK-darknet the following error occurs:

[64/147] LINK bin/transform-benchmark FAILED: /home/smarteagle/NNPACK-darknet/bin/transform-benchmark g++ -pthread -o /home/smarteagle/NNPACK-darknet/bin/transform-benchmark /home/smarteagle/NNPACK-darknet/build/bench/transform.c.o /home/smarteagle/NNPACK-darknet/build/bench/median.c.o /home/smarteagle/NNPACK-darknet/build/bench/memread.c.o -lrt /home/smarteagle/NNPACK-darknet/lib/libnnpack.a /home/smarteagle/NNPACK-darknet/lib/libpthreadpool.a /home/smarteagle/NNPACK-darknet/lib/libpthreadpool.a(pthreads.c.o): In function pthreadpool_create': /home/smarteagle/NNPACK-darknet/deps/pthreadpool/src/pthreads.c:260: undefined reference to pthreadpool_allocate' /home/smarteagle/NNPACK-darknet/lib/libpthreadpool.a(pthreads.c.o): In function pthreadpool_destroy': /home/smarteagle/NNPACK-darknet/deps/pthreadpool/src/pthreads.c:461: undefined reference to pthreadpool_deallocate' /usr/bin/ld: /home/smarteagle/NNPACK-darknet/bin/transform-benchmark: internal symbol `pthreadpool_deallocate' isn't defined /usr/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status [69/147] CXX deps/googletest/googletest/src/gtest-all.cc ninja: build stopped: subcommand failed.

I am using a raspberry pi 3A PLUS Rev 1.0 with Raspian stretch. The requirements all installed succesfully.

[mrhosseini]

check https://github.com/digitalbrain79/NNPACK-darknet/issues/3#issuecomment-849705541