find_package(Doxygen)

if(DOXYGEN_FOUND)
    configure_file(Doxyfile.in ${CMAKE_BINARY_DIR}/Doxyfile @ONLY)
    add_custom_target(doc
                      ${DOXYGEN_EXECUTABLE} ${CMAKE_BINARY_DIR}/Doxyfile
                      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
                      COMMENT "Generate API documentation with Doxygen" VERBATIM)
endif()