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add_custom_target (documentation)

find_program (DOXYGEN_PATH doxygen)
if (DOXYGEN_PATH)
    add_custom_target (documentation-doxygen
                       COMMAND ${DOXYGEN_PATH} Doxyfile
                       WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
    add_dependencies (documentation documentation-doxygen)
else ()
    message (WARNING "Doxygen is not found - source-code documentation is not available")
endif ()