Comment (by Roland Haas):

The pull request makes use of PETSc functions VecGetArrayRead and VecRestoreArrayRead which have existed since PETSc 3.2 so should be present in all versions of PETSc we are likely to encounter on clusters (it is from Thu Sep 8 12:03:44 2011 -0500).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2421/make-tatpetsc-work-with-petsc-3125