Failure for 6.8.3

[nrdrinkwater]

Thank you for tackling this issue. I've been following your guide to build QtWebengine for Qt 6.8.3, replacing instance of 6.9.0 with 6.8.3. Everything works well through step 4. When I follow the instructions in step 5, I get:
Microsoft Windows [Version 10.0.26100.4946]
(c) Microsoft Corporation. All rights reserved.

C:\src>envarmslim.cmd

C:\src>REM Set up Windows SDK for 64bit

C:\src>set PATH=C:\Qt\6.8.3\msvc2022_arm64\bin;C:\Dev\Python313\Scripts;C:\Dev\Python313;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0;C:\WINDOWS\System32\OpenSSH;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files\Git\cmd;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;%NVM_HOME%;%NVM_SYMLINK%;C:\Users\Drinkwater\AppData\Local\Microsoft\WindowsApps;C:\Users\Drinkwater\AppData\Local\GitHubDesktop\bin;C:\Users\Drinkwater\AppData\Local\nvm;C:\nvm4w\nodejs

C:\src>CALL "c:\program files\microsoft visual studio\2022\community\vc\auxiliary\build\vcvarsamd64_arm64.bat"

---

** Visual Studio 2022 Developer Command Prompt v17.14.13
** Copyright (c) 2025 Microsoft Corporation

---

[vcvarsall.bat] Environment initialized for: 'x64_arm64'

C:\src>cd build-qtwebengine-arm64

C:\src\build-qtwebengine-arm64>C:\Qt\6.8.3\msvc2022_arm64\bin\qt-configure-module.bat ..\qtwebengine -- -DQT_HOST_PATH=C:\Qt\6.8.3\msvc2022_64 -DFEATURE_webengine_build=OFF
-- Windows 10 SDK version: 10.0.26100.0
'C:\Qt\6.8.3\msvc2022_arm64\bin\qt-cmake-private.bat' '-DQT_HOST_PATH=C:\Qt\6.8.3\msvc2022_64' '-DFEATURE_webengine_build=OFF' '-DQT_INTERNAL_CALLED_FROM_CONFIGURE:BOOL=TRUE' 'C:/src/qtwebengine'
-- The C compiler identification is MSVC 19.44.35215.0
-- The CXX compiler identification is MSVC 19.44.35215.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.44.35207/bin/Hostx64/arm64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.44.35207/bin/Hostx64/arm64/cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - not found
-- Found Threads: TRUE
-- Performing Test HAVE_STDATOMIC
-- Performing Test HAVE_STDATOMIC - Success
-- Found WrapAtomic: TRUE
-- Building for multiple configurations: RelWithDebInfo;Debug.
-- Main configuration is: RelWithDebInfo.
-- Windows 10 SDK version: 10.0.26100.0
-- Support check for QtWebEngine failed: Build can be done only on Linux, Windows or macOS.
-- Support check for QtPdf failed: Build can be done only on Linux, Windows, macO, iOS and Android.

-- Configuration summary has been written to C:/src/build-qtwebengine-arm64/config.summary

WARNING: QtWebEngine won't be built. Build can be done only on Linux, Windows or macOS.
WARNING: QtPdf won't be built. Build can be done only on Linux, Windows, macO, iOS and Android.

-- Configuring done (16.3s)
-- Generating done (0.0s)
CMake Warning:
Manually-specified variables were not used by the project:

FEATURE_webengine_build
QT_USE_ORIGINAL_COMPILER

-- Build files have been written to: C:/src/build-qtwebengine-arm64

C:\src\build-qtwebengine-arm64>

Any advice on how to avoid the error would be appreciated.
N. Drinkwater