/usr/share/dune/aclocal/dune-unordered-containers.m4 is in libdune-pdelab-dev 2.0.0-1.
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 6 7 8 9 | ## -*- autoconf -*-
AC_DEFUN([DUNE_UNORDERED_HEADERS], [
# Only run the check if we also run the basic tr1 test from dune-common.
AC_LANG_PUSH([C++])
AS_IF([test "x$enable_tr1_headers" != "xno"],
[AC_CHECK_HEADERS([unordered_map tr1/unordered_map unordered_set tr1/unordered_set])
])
AC_LANG_POP([C++])
])
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