set(doxyfile_in ${CMAKE_SOURCE_DIR}/doc/documentation-config.doxygen.in)
    set(doxyfile ${CMAKE_BINARY_DIR}/Doxyfile)

    configure_file(${doxyfile_in} ${doxyfile} @ONLY)

    add_custom_target(doc
        COMMAND ${DOXYGEN_EXECUTABLE} ${doxyfile}
        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
        COMMENT "Generating API documentation with Doxygen"
        VERBATIM)

    add_custom_target(chm
    COMMAND chmcmd index.hhp
        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/doc
        COMMENT "Generating API documentation with chmcmd"
        VERBATIM)

Error: Anchor Memory_8cpp.html#a1e349bf268cc8c667b3d264111b6a3c1 undefined; first use Memory_8cpp.html