INFERENCE_ENGINE_LIB not set error in Cmake

Question

I'm trying to run the gender_age sample (https://github.com/movidius/ncappzoo/tree/master/apps/gender_age) in my raspberry pi 4 with intel movidius Myriad X VPU and I have an error

I follow the tutorial https://software.intel.com/en-us/articles/get-started-with-neural-compute-stick until the Next Steps: The ncappzoo title here is my error

Intel OpenVINO environment is already set!
(mkdir -p build; cd build; cmake ..; make;)
-- The C compiler identification is GNU 8.3.0
-- The CXX compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
INFERENCE_ENGINE_LIB
    linked by target "gender_age" in directory /home/pi/Documents/ncappzoo/apps/gender_age

-- Configuring incomplete, errors occurred!
See also "/home/pi/Documents/ncappzoo/apps/gender_age/build/CMakeFiles/CMakeOutput.log".
make[1] : on entre dans le répertoire « /home/pi/Documents/ncappzoo/apps/gender_age/build »
make[1]: *** Pas de cible spécifiée et aucun makefile n'a été trouvé. Arrêt.
make[1] : on quitte le répertoire « /home/pi/Documents/ncappzoo/apps/gender_age/build »
make: *** [Makefile:68: compile_cpp] Error 2

Answer 1

The CMake file for this example depends on the OpenVino environment variables. Assuming you have installed OpenVino, using it typically requires the OpenVino environment variables to be set, either in the current command prompt, or permanently in your System environment variables. As this answer describes, you can set each of these individually, or run the environment variable script before proceeding with your cmake command:

> C:/path/to/your/openvino/opencv/setupvars.bat

After running this in your command prompt, the command cmake .. should be able to access these environment variables (particularly INTEL_CVSDK_DIR) and succeed in generating the buildsystem. Then, you can compile the example with make.