Anil

> I've tried another solution to change SparseMatrix::Index to int in ORB_SLAM2/Thirdparty/g2o/g2o/solvers/linear_solver_eigen.h but nothing worked. Try doing the opposite. I fixed it by changing `typedef Eigen::PermutationMatrix PermutationMatrix;` to `typedef Eigen::PermutationMatrix...

Looks like your compiler is dying, so not sure if this is the same issue I've had. I fixed it by changing [`typedef Eigen::PermutationMatrix PermutationMatrix;` ](https://github.com/raulmur/ORB_SLAM2/blob/master/Thirdparty/g2o/g2o/solvers/linear_solver_eigen.h#L56) to `typedef Eigen::PermutationMatrix PermutationMatrix;`...

I use the `§` as a modifier on tmux it's a key I would rarely ever use in a terminal and if I have to I just tap it twice....