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I had a problem where CMake picked up half of ICU from its C API, which is included with the Windows SDK, and half from the C++ API we provide. This should prevent that. * ICU_ROOT takes precedence as a CMake variable so do that instead of as an environment variable. * ICU_LIBRARY is an output of FindICU.cmake, not an input, so don't set it. * FindICU.cmake needs telling about components via their own variables.