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It seems that Eigen::internal::real_2x2_jacobi_svd funtion is defined twice.

Please reinstall Eigen.

As shown in the following commit, it seems to move the function from JacobiSVD.h to RealSvd2x2.h. https://bitbucket.org/eigen/eigen/commits/eb8d87ca2cfc24629a76942b445880a199a2d5e2

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