libTKJniSample.so missing in Android3D Viewer

When building the OCC sample jinitviwer for android, available in "opencascade-7.6.0", the build fails and I am confronted with the following error message, telling "libTKJniSample.so" is missing:

Build command failed.
Error while executing process C:\Users\MASTER\AppData\Local\Android\Sdk\cmake\3.10.2.4988404\bin\ninja.exe with arguments {-C C:\Users\MASTER\Downloads\opencascade-7.6.0\opencascade-7.6.0\samples\java\jniviewer\app\.cxx\cmake\debug\arm64-v8a TKJniSample}
ninja: Entering directory `C:\Users\MASTER\Downloads\opencascade-7.6.0\opencascade-7.6.0\samples\java\jniviewer\app\.cxx\cmake\debug\arm64-v8a'

ninja: error: 'C:/Users/MASTER/Downloads/opencascade-7.6.0/opencascade-7.6.0/libs/arm64-v8a/libTKernel.so', needed by 'C:/Users/MASTER/Downloads/opencascade-7.6.0/opencascade-7.6.0/samples/java/jniviewer/app/build/intermediates/cmake/debug/obj/arm64-v8a/libTKJniSample.so', missing and no known rule to make it

Couldn't find such file in the whole internet. What is the problem?? I'm using Android Studio 3.1.

Best Regards