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

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The actual contents of the file can be viewed below.

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# Module providing convenience methods for compile binaries with Alberta support.
#
# .. cmake_function:: add_dune_alberta_flags
#
#    .. cmake_param:: targets
#       :single:
#       :required:
#       :positional:
#
#       The targets to add the Alberta flags to.
#
#    .. cmake_param:: OBJECT|SOURCE_ONLY
#       :option:
#
#       TODO: doc me
#
#    .. cmake_param:: USE_GENERIC
#       :option:
#
#       TODO doc me
#
#    .. cmake_param:: GRIDDIM
#       :single:
#
#       The dimension of the grid, defaults to 2.
#
#    .. cmake_param:: WORLDDIM
#       :single:
#
#       The dimension of the world space, defaults to :code:`GRIDDIM`.
#

macro(add_dune_alberta_flags)
  if(ALBERTA_FOUND)
    include(CMakeParseArguments)
    cmake_parse_arguments(ADD_ALBERTA
      "OBJECT;SOURCE_ONLY;USE_GENERIC;NO_LINK_DUNEALBERTAGRID" "GRIDDIM;WORLDDIM" "" ${ARGN})

    if(ADD_ALBERTA_GRIDDIM AND NOT ADD_ALBERTA_WORLDDIM)
      set(ADD_ALBERTA_WORLDDIM ${ADD_ALBERTA_GRIDDIM})
    endif(ADD_ALBERTA_GRIDDIM AND NOT ADD_ALBERTA_WORLDDIM)

    if(ADD_ALBERTA_WORLDDIM AND NOT ADD_ALBERTA_GRIDDIM)
      set(ADD_ALBERTA_GRIDDIM ${ADD_ALBERTA_WORLDDIM})
    endif(ADD_ALBERTA_WORLDDIM AND NOT ADD_ALBERTA_GRIDDIM)

    if(NOT ADD_ALBERTA_WORLDDIM)
      message(WARNING "Alberta dimension not set. Please set it, e.g. use add_dune_alberta_flags(GRIDDIM 2 <target>). Falling back to dimension 2.")
      set(ADD_ALBERTA_WORLDDIM 2)
      set(ADD_ALBERTA_GRIDDIM ${ADD_ALBERTA_WORLDDIM})
    else(NOT ADD_ALBERTA_WORLDDIM)
      list(FIND ALBERTA_WORLD_DIMS ${ADD_ALBERTA_WORLDDIM} _index)
      if(_index EQUAL -1)
        message(FATAL_ERROR "There is no alberta library for dimension ${ADD_ALBERTA_WORLDDIM}.")
      endif(_index EQUAL -1)
    endif(NOT ADD_ALBERTA_WORLDDIM)

    if(ADD_ALBERTA_SOURCE_ONLY)
      set(_prefix SOURCE)
      set(_source_only SOURCE_ONLY)
    else()
      set(_prefix TARGET)
      if(NOT ADD_ALBERTA_OBJECT)
        # link to ALBERTA libraries
        foreach(_target ${ADD_ALBERTA_UNPARSED_ARGUMENTS})
          if(NOT ADD_ALBERTA_NO_LINK_DUNEALBERTAGRID)
            target_link_libraries(${_target}
              dunealbertagrid_${ADD_ALBERTA_GRIDDIM}d)
          endif(NOT ADD_ALBERTA_NO_LINK_DUNEALBERTAGRID)
          target_link_libraries(${_target}
            ${ALBERTA_${ADD_ALBERTA_WORLDDIM}D_LIB}
            dunegrid ${DUNE_LIBS} ${ALBERTA_UTIL_LIB} ${ALBERTA_EXTRA_LIBS})
        endforeach(_target ${ADD_ALBERTA_UNPARSED_ARGUMENTS})
      endif()
    endif(ADD_ALBERTA_SOURCE_ONLY)

    include_directories(${ALBERTA_INCLUDES})
    set_property(${_prefix} ${ADD_ALBERTA_UNPARSED_ARGUMENTS}
      APPEND PROPERTY
      COMPILE_DEFINITIONS ENABLE_ALBERTA
      ALBERTA_DIM=${ADD_ALBERTA_WORLDDIM})
    if(ADD_ALBERTA_USE_GENERIC)
      set_property(${_prefix} ${ADD_ALBERTA_UNPARSED_ARGUMENTS}
        APPEND PROPERTY
        COMPILE_DEFINITIONS DUNE_ALBERTA_USE_GENERICGEOMETRY=1)
    endif(ADD_ALBERTA_USE_GENERIC)
  endif(ALBERTA_FOUND)
endmacro(add_dune_alberta_flags)