find_package(Doxygen REQUIRED)

configure_file(Doxyfile.in "${CMAKE_CURRENT_BINARY_DIR}/Doxyfile")

add_custom_target(doc ALL
    "${DOXYGEN_EXECUTABLE}" "${CMAKE_CURRENT_BINARY_DIR}/Doxyfile"
)

install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/html"
    DESTINATION "${DOC_INSTALL_DIR}"
)