xtensor
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Chane CMakeLists.txt to allow for cmake to run on Ubuntu 20.04 and cmake 3.16.3
This change is required for my system to run cmake. I run Ubuntu 20.04.2 LTS and cmake version 3.16.3.
Checklist
- [ ] The title and commit message(s) are descriptive.
- [ ] Small commits made to fix your PR have been squashed to avoid history pollution.
- [ ] Tests have been added for new features or bug fixes.
- [ ] API of new functions and classes are documented.