OpenCL cannot find GPU device: NVIDIA GPU (Quadro K4000) + Visual Studio 2015

size_t numPlatforms;
err = clGetPlatformIDs(0, NULL, &numPlatforms);
assert(numPlatforms > 0);
cl_platform_id platform_ids[numPlatforms];
err = clGetPlatformIDs(numPlatforms, platform_ids, NULL);

cl_platform_id platform_id;
err = clGetPlatformIDs(1, &platform_id, NULL);
assert(err == CL_SUCCESS);

// Note: this has to be done for each `cl_platform_id`
// until you find the device you were looking for
size_t numDevices;
err = clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_GPU, 0, NULL, &numDevices);
assert(numDevices > 0);
cl_device_id devices[numDevices];
err = clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_GPU, numDevices, devices, NULL);

cl_device_id device;
err = clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_GPU, 1, &device, NULL);
assert(err == CL_SUCCESS);