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/usr/share/dune/cmake/modules/CheckExperimentalGridExtensions.cmake is in libdune-grid-dev 2.5.1-1.

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#
# Dune's experimental grid extensions are enabled by adding
# -DDUNE_GRID_EXPERIMENTAL_GRID_EXTENSIONS=TRUE to the
# CMAKE_FLAGS
# This file adds the summary line for the flag.
#

include(FeatureSummary)
add_feature_info("Experimental grid extensions"
  DUNE_GRID_EXPERIMENTAL_GRID_EXTENSIONS
  "Enables additional grid features.")