This file is indexed.

/usr/share/dune/aclocal/dune_istl.m4 is in libdune-istl-dev 2.2.1-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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AC_DEFUN([DUNE_ISTL_CHECKS],
[
  # call IMDX_LIB_METIS directly and not via AC_REQUIRE
  # because AC_REQUIRE support not allow parameters
  IMMDX_LIB_METIS(,[true])
  AC_REQUIRE([DUNE_PATH_PARMETIS])
  AC_REQUIRE([DUNE_PATH_SUPERLU])
  AC_REQUIRE([DUNE_PATH_SUPERLU_DIST])
  AC_REQUIRE([DUNE_PARDISO])
  AC_REQUIRE([__AC_FC_NAME_MANGLING])
  AC_REQUIRE([AC_PROG_F77])
  AC_REQUIRE([ACX_BLAS])
  DUNE_BOOST_BASE(, [ DUNE_BOOST_FUSION ] , [] )
  
  # add summary entries for tests not maintained by dune
  DUNE_ADD_SUMMARY_ENTRY([METIS],[$with_metis])
  DUNE_ADD_SUMMARY_ENTRY([BLAS],[$acx_blas_ok])
])

AC_DEFUN([DUNE_ISTL_CHECK_MODULE],
[
    DUNE_CHECK_MODULES([dune-istl], [istl/istlexception.hh])
])