what is the value of OPENCL_LIBRARY

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I want to build OpenCV 3.1 with OpenCL enabled for Visual Studio 2013. What should I write in the value of OPENCL_LIBRARY in the cMake? I put C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5/lib/x64/OpenCL.lib since I am intended to utilize the GPU from OpenCL.. Is that valid?