ndk-build tutorial-4-opencl

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Hello everyone,

I was searching around for ways to use camera2 with OpenCV, and came across this tutorial. However, whenever I try to build the JNI part of the code, I egt the following error:

jni/Android.mk:18: *** Specify OPENCL_SDK to Android OpenCL SDK location.  Stop.

I've tried to find a fix for this, however I haven't been able to do it. I could really use some help regarding this. Thanks