Build OpenCV 3.2 with IPP_A

I want to build OpenCV 3.2 (for Visual Studio 2015, Win64) with IPP_A. When I tick `WITH_IPP_A` in CMake and configure again, I get the following values: IPP_A_INCLUDE_DIR = IPP_A_INCLUDE_DIR-NOTFOUND IPP_A_LIBRARIES = IPP_A_LIBRARIES-NOTFOUND How can I fix this? Downloading it from intel just gives me an IPP folder without an include, etc. folder.