find_package(Doxygen
    REQUIRED dot
    OPTIONAL_COMPONENTS mscgen dia)

if (DOXYGEN_FOUND)
  set(DOXYGEN_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in)
  set(DOXYGEN_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)

  configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)
  message("Doxygen build started")

  add_custom_target(libeverest_io_doc_doxygen
    COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
    COMMENT "Generating API documentation with Doxygen"
    VERBATIM )
else (DOXYGEN_FOUND)
  message("Doxygen need to be installed to generate the doxygen documentation")
endif (DOXYGEN_FOUND)