External libraries included:

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Eigen                       3.4.90                            
Installed from gitlab

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Eigen                       3.2.5                            Mainly MPL2 license
A high-level C++ library of template headers for linear algebra, matrix and
vector operations, numerical solvers and related algorithms
http://eigen.tuxfamily.org/
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flann                       1.8.4                                    BSD license
A C++ library for performing fast approximate nearest neighbor searches in high
dimensional spaces
http://www.cs.ubc.ca/research/flann/
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