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libc++ from 3.4 onwards supports constexpr std::get, but only if compiled with -std=c++1y. Change the detection so that libc++'s internals are only used if either -std=c++1y is not specified or the library is too old, making the whole hack a bit more future-proof.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
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