5.15.2 Wasm error: use of undeclared identifier 'QDeadlineTimer'

cd tools/rcc/ && ( test -e Makefile || /qt5/qtbase/bin/qmake -o Makefile /qt5/qtbase/src/tools/rcc/rcc.pro ) && make -f Makefile 
make[3]: Entering directory '/qt5/qtbase/src/tools/rcc'
make[3]: Nothing to be done for 'first'.
make[3]: Leaving directory '/qt5/qtbase/src/tools/rcc'
cd tools/tracegen/ && ( test -e Makefile || /qt5/qtbase/bin/qmake -o Makefile /qt5/qtbase/src/tools/tracegen/tracegen.pro ) && make -f Makefile 
make[3]: Entering directory '/qt5/qtbase/src/tools/tracegen'
make[3]: Nothing to be done for 'first'.
make[3]: Leaving directory '/qt5/qtbase/src/tools/tracegen'
cd 3rdparty/pcre2/ && ( test -e Makefile || /qt5/qtbase/bin/qmake -o Makefile /qt5/qtbase/src/3rdparty/pcre2/pcre2.pro ) && make -f Makefile 
make[3]: Entering directory '/qt5/qtbase/src/3rdparty/pcre2'
make[3]: Nothing to be done for 'first'.
make[3]: Leaving directory '/qt5/qtbase/src/3rdparty/pcre2'
cd corelib/ && ( test -e Makefile || /qt5/qtbase/bin/qmake -o Makefile /qt5/qtbase/src/corelib/corelib.pro ) && make -f Makefile 
make[3]: Entering directory '/qt5/qtbase/src/corelib'
em++ -c -pipe -O3 -std=c++1z -fvisibility=hidden -fvisibility-inlines-hidden -s ALLOW_MEMORY_GROWTH=1 -Wall -Wextra -Wdate-time -Winconsistent-missing-override -DQT_NO_LINKED_LIST -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_USING_NAMESPACE -DQT_NO_FOREACH -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_CORE_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_DEPRECATED_WARNINGS_SINCE=0x060000 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DPCRE2_CODE_UNIT_WIDTH=16 -I. -I../3rdparty/zlib/src -Iglobal -I../3rdparty/md5 -I../3rdparty/md4 -I../3rdparty/sha3 -I../3rdparty -I../3rdparty/double-conversion/include -I../3rdparty/harfbuzz/src -I../3rdparty/forkfd -I../3rdparty/tinycbor/src -I.rcc -I../../include -I../../include/QtCore -I../../include/QtCore/5.15.2 -I../../include/QtCore/5.15.2/QtCore -I.moc -I.tracegen -I../3rdparty/pcre2/src -I../../mkspecs/wasm-emscripten -o .obj/qlogging.o global/qlogging.cpp
In file included from global/qlogging.cpp:58:
In file included from ../../include/QtCore/qthread.h:1:
../../include/QtCore/../../src/corelib/thread/qthread.h:137:15: error: unknown type name 'QDeadlineTimer'
    bool wait(QDeadlineTimer deadline = QDeadlineTimer(QDeadlineTimer::Forever));
              ^
../../include/QtCore/../../src/corelib/thread/qthread.h:137:56: error: use of undeclared identifier 'QDeadlineTimer'
    bool wait(QDeadlineTimer deadline = QDeadlineTimer(QDeadlineTimer::Forever));
                                                       ^
2 errors generated.
shared:ERROR: '/emsdk/upstream/bin/clang++ -target wasm32-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=39 -D__EMSCRIPTEN_tiny__=8 -D_LIBCPP_ABI_VERSION=2 -Dunix -D__unix -D__unix__ -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem/emsdk/upstream/emscripten/system/include/libcxx -Xclang -isystem/emsdk/upstream/emscripten/system/lib/libcxxabi/include -Xclang -isystem/emsdk/upstream/emscripten/system/include/compat -Xclang -isystem/emsdk/upstream/emscripten/system/include -Xclang -isystem/emsdk/upstream/emscripten/system/include/libc -Xclang -isystem/emsdk/upstream/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem/emsdk/upstream/emscripten/system/local/include -Xclang -isystem/emsdk/upstream/emscripten/cache/wasm-obj/include -c -pipe -O3 -std=c++1z -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Wextra -Wdate-time -Winconsistent-missing-override -DQT_NO_LINKED_LIST -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_USING_NAMESPACE -DQT_NO_FOREACH -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_CORE_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_DEPRECATED_WARNINGS_SINCE=0x060000 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DPCRE2_CODE_UNIT_WIDTH=16 -I. -I../3rdparty/zlib/src -Iglobal -I../3rdparty/md5 -I../3rdparty/md4 -I../3rdparty/sha3 -I../3rdparty -I../3rdparty/double-conversion/include -I../3rdparty/harfbuzz/src -I../3rdparty/forkfd -I../3rdparty/tinycbor/src -I.rcc -I../../include -I../../include/QtCore -I../../include/QtCore/5.15.2 -I../../include/QtCore/5.15.2/QtCore -I.moc -I.tracegen -I../3rdparty/pcre2/src -I../../mkspecs/wasm-emscripten -DEMSCRIPTEN global/qlogging.cpp -Xclang -isystem/emsdk/upstream/emscripten/system/include/SDL -c -o .obj/qlogging.o -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr' failed (1)

gcc --version
gcc (Debian 8.3.0-6) 8.3.0

cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 10 (buster)"

cd /
git clone --recursive https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install 1.39.8
./emsdk activate --embedded 1.39.8

em++ --version
emcc (Emscripten gcc/clang-like replacement) 1.39.8 (commit 372fb501244f29734b61f889a2ef24c2456a3484)
Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

LANG=C ./configure -xplatform wasm-emscripten -nomake examples -no-compile-examples -prefix /usr/local/wasm -opensource -confirm-license

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: wasm-emscripten (wasm, CPU features: <none>)
Target compiler: clang 11.0.0
Configuration: cross_compile largefile release c++11 c++14 c++17 c++1z no-pkg-config reduce_exports static stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. no
  Using C standard ....................... C11
  Using C++ standard ..................... C++17
  Using ccache ........................... no
  Relocatable ............................ no
  Using precompiled headers .............. no
  Using LTCG ............................. no
  Target compiler supports:
  Build parts ............................ libs
Qt modules and options:
  Qt Concurrent .......................... no
  Qt D-Bus ............................... no
  Qt D-Bus directly linked to libdbus .... no
  Qt Gui ................................. yes
  Qt Network ............................. yes
  Qt Sql ................................. no
  Qt Testlib ............................. yes
  Qt Widgets ............................. yes
  Qt Xml ................................. yes
Support enabled for:
  Using pkg-config ....................... no
  udev ................................... no
  Using system zlib ...................... no
  Zstandard support ...................... no
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... no
  iconv .................................. yes
  ICU .................................... no
  Built-in copy of the MIME database ..... yes
  Tracing backend ........................ <none>
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  PCRE2 .................................. yes
    Using system PCRE2 ................... no
Qt Network:
  getifaddrs() ........................... no
  IPv6 ifname ............................ no
  libproxy ............................... no
  OpenSSL ................................ no
    Qt directly linked to OpenSSL ........ no
  OpenSSL 1.1 ............................ no
  DTLS ................................... no
  OCSP-stapling .......................... no
  SCTP ................................... no
  Use system proxies ..................... yes
  GSSAPI ................................. no
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ no
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ no
  Fontconfig ............................. no
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... no
    PNG .................................. yes
      Using system libpng ................ no
  Text formats:
    HtmlParser ........................... yes
    CssParser ............................ yes
    OdfWriter ............................ yes
    MarkdownReader ....................... yes
      Using system libmd4c ............... no
    MarkdownWriter ....................... yes
  EGL .................................... yes
  OpenVG ................................. no
  OpenGL:
    Desktop OpenGL ....................... no
    OpenGL ES 2.0 ........................ yes
    OpenGL ES 3.0 ........................ yes
    OpenGL ES 3.1 ........................ no
    OpenGL ES 3.2 ........................ no
  Vulkan ................................. no
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. no
  libinput ............................... no
  INTEGRITY HID .......................... no
  mtdev .................................. no
  tslib .................................. no
  xkbcommon .............................. no
  X11 specific:
    XLib ................................. no
    XCB Xlib ............................. no
    EGL on X11 ........................... no
    xkbcommon-x11 ........................ no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. no
  LinuxFB ................................ no
  VNC .................................... no
Qt Sql:
  SQL item models ........................ yes
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... no
Qt Sql Drivers:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... no
  PostgreSQL ............................. no
  SQLite2 ................................ no
  SQLite ................................. yes
    Using system provided SQLite ......... no
  TDS (Sybase) ........................... no
Qt Testlib:
  Tester for item models ................. yes
Qt SerialBus:
  Socket CAN ............................. no
  Socket CAN FD .......................... no
  SerialPort Support ..................... no
Further Image Formats:
  JasPer ................................. no
  MNG .................................... no
  TIFF ................................... yes
    Using system libtiff ................. no
  WEBP ................................... yes
    Using system libwebp ................. no
Qt QML:
  QML network support .................... yes
  QML debugging and profiling support .... yes
  QML just-in-time compiler .............. no
  QML sequence object .................... yes
  QML XML http request ................... yes
  QML Locale ............................. yes
Qt QML Models:
  QML list model ......................... yes
  QML delegate model ..................... yes
Qt Quick:
  Direct3D 12 ............................ no
  AnimatedImage item ..................... yes
  Canvas item ............................ yes
  Support for Qt Quick Designer .......... yes
  Flipable item .......................... yes
  GridView item .......................... yes
  ListView item .......................... yes
  TableView item ......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  Repeater item .......................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
QtQuick3D:
  Assimp ................................. yes
  System Assimp .......................... no
Qt Scxml:
  ECMAScript data model for QtScxml ...... yes
Qt Gamepad:
  SDL2 ................................... no
Qt 3D GeometryLoaders:
  Autodesk FBX ........................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Bluetooth:
  BlueZ .................................. no
  BlueZ Low Energy ....................... no
  Linux Crypto API ....................... no
  Native Win32 Bluetooth ................. no
  WinRT Bluetooth API (desktop & UWP) .... no
  WinRT advanced bluetooth low energy API (desktop & UWP) . no
Qt Sensors:
  sensorfw ............................... no
Qt Quick Controls 2:
  Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
  Hover support .......................... yes
  Multi-touch support .................... yes
Qt Positioning:
  Gypsy GPS Daemon ....................... no
  WinRT Geolocation API .................. no
Qt Location:
  Qt.labs.location experimental QML plugin . yes
  Geoservice plugins:
    OpenStreetMap ........................ no
    HERE ................................. yes
    Esri ................................. yes
    Mapbox ............................... yes
    MapboxGL ............................. yes
    Itemsoverlay ......................... yes
QtXmlPatterns:
  XML schema support ..................... yes
Qt Multimedia:
  ALSA ................................... no
  GStreamer 1.0 .......................... no
  GStreamer 0.10 ......................... no
  Video for Linux ........................ no
  OpenAL ................................. yes
  PulseAudio ............................. no
  Resource Policy (libresourceqt5) ....... no
  Windows Audio Services ................. no
  DirectShow ............................. no
  Windows Media Foundation ............... no
Qt TextToSpeech:
  Flite .................................. no
  Flite with ALSA ........................ no
  Speech Dispatcher ...................... no
Qt Tools:
  Qt Assistant ........................... yes
  Qt Designer ............................ yes
  Qt Distance Field Generator ............ yes
  kmap2qmap .............................. yes
  Qt Linguist ............................ yes
  Mac Deployment Tool .................... no
  makeqpf ................................ yes
  pixeltool .............................. yes
  qdbus .................................. yes
  qev .................................... yes
  Qt Attributions Scanner ................ yes
  qtdiag ................................. yes
  qtpaths ................................ yes
  qtplugininfo ........................... yes
  Windows deployment tool ................ no
  WinRT Runner Tool ...................... no
Qt Tools:
  QDoc ................................... no
Qt WebEngine Build Tools:
  Use System Ninja ....................... no
  Use System Gn .......................... no
  Jumbo Build Merge Limit ................ 8
  Developer build ........................ no
  Sanitizer .............................. no
  QtWebEngine required system libraries:
    fontconfig ........................... no
    dbus ................................. no
    nss .................................. no
    khr .................................. yes
    glibc ................................ no
  Optional system libraries used:
    re2 .................................. no
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . no
    opus ................................. no
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... no
    glib ................................. no
    zlib ................................. no
    minizip .............................. no
    libevent ............................. no
    jsoncpp .............................. no
    protobuf ............................. no
    libxml2 and libxslt .................. no
    lcms2 ................................ no
    png .................................. no
    JPEG ................................. no
    harfbuzz ............................. no
    freetype ............................. noNote: Also available for Linux: linux-clang linux-iccNote: Using static linking will disable the use of dynamically
loaded plugins. Make sure to import all needed static plugins,
or compile needed modules into the library.Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.Note: The following modules are not being compiled in this configuration:
    serialport
    3dcore
    3drender
    webenginecore
    webengine
    webenginewidgets
    pdf
    pdfwidgetsWARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
On macOS, you can use Homebrew's llvm package.
On Windows, you must set LLVM_INSTALL_DIR to the installation path.WARNING: QtWebEngine can be built only on Linux, Windows or macOS.WARNING: QtPdf can be built only on Linux, Windows, macOS or iOS.WARNING: QtWebEngine will not be built.WARNING: QtPdf will not be built.