hubutui opened a new issue #17845: openmp in CMakeLists.txt needs to be updated URL: https://github.com/apache/incubator-mxnet/issues/17845 Currently, cmake check if `${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/openmp/CMakeLists.txt` exists, check [here](https://github.com/apache/incubator-mxnet/blob/master/CMakeLists.txt#L430), then build openmp from source, which is always true, and cmake will never use openmp provided in system, check [here](https://github.com/apache/incubator-mxnet/blob/master/CMakeLists.txt#L444) . So these codes need to to reordered. Another issue, the minimum cmake version is 3.13, and according to cmake [doc](https://cmake.org/cmake/help/v3.13/module/FindOpenMP.html), `OpenMP_FOUND` is used, not `OPENMP_FOUND`, this [line](https://github.com/apache/incubator-mxnet/blob/master/CMakeLists.txt#L446) needs to be updated, too.
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