/usr/include/dune/pdelab/backend/istlmatrixbackend.hh is in libdune-pdelab-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | // -*- tab-width: 4; indent-tabs-mode: nil -*-
#ifndef DUNE_PDELAB_BACKEND_ISTLMATRIXBACKEND_HH
#warning "The file dune/pdelab/backend/istlmatrixbackend.hh is deprecated. Please use dune/pdelab/backend/istl.hh instead."
#include <dune/pdelab/backend/istl.hh>
#endif // DUNE_PDELAB_BACKEND_ISTLMATRIXBACKEND_HH
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