/usr/share/dune/aclocal/dune_experimental_grid_extensions.m4 is in libdune-grid-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.
1 2 3 4 5 6 7 8 9 10 11 | dnl This macro introduces a configure flag --enable-experimental-grid-extensions
dnl that is used to publicly grant access to the implementation of the dune-grid
dnl facades (e.g., Entity, Geometry, etc.).
AC_DEFUN([DUNE_EXPERIMENTAL_GRID_EXTENSIONS],[
AC_ARG_ENABLE(experimental-grid-extensions,
AS_HELP_STRING([--enable-experimental-grid-extensions],[If this is set, public access to the implementation of facades like Entity, Geometry, etc. is granted.]))
AS_IF([test "x$enable_experimental_grid_extensions" = "xyes"],
AC_DEFINE(DUNE_GRID_EXPERIMENTAL_GRID_EXTENSIONS, 1, [If this is set, public access to the implementation of facades like Entity, Geometry, etc. is granted.]))
])
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