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There could be two possibilities.

1. You don't have IPP installed and trying to compile opencv with IPP.
2. You don't have IPP installed properly ie, paths are not properly installed.

Possible solution.

1. Make sure IPP is installed properly and run basis IPP tests if necessary.
2. If it's not installed, you can add this flag -D BUILD_IPP=ON to build library with opencv compilation.

Hope it helps.