Unsolved How to build QtWebEngine with Python3?

[jiapei1000]

My ENV:

➜  ~ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal
➜  ~ python --version 
Python 3.8.10
➜  ~ gcc --version
gcc (GCC) 10.3.1 20210627
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Note: Also available for Linux: linux-clang linux-icc

Note: The following modules are not being compiled in this configuration:
    webenginecore
    webengine
    webenginewidgets
    pdf
    pdfwidgets

WARNING: 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: Python version 2 (2.7.5 or later) is required to build QtWebengine.

WARNING: Python version 2 (2.7.5 or later) is required to build QtPdf.

WARNING: QtWebEngine will not be built.

WARNING: QtPdf will not be built.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/usr/local/Qt-5.15.2'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

In fact, even if I installed python2, I still failed to build QtWebEngine with the same above ERROR messages.

It looks it's recommended to build QtWebEngine separately, for instance: https://www.linuxfromscratch.org/blfs/view/svn/x/qtwebengine.html

Cheers
Pei

[eyllanesc]

@jiapei1000 1) QtWebEngine requires python2 because chromium requires it so you can't change it. 2) I have tried to compile QtWebEngine with ubuntu 20.04 but using ubuntu 18.04 with the same configuration I have been able to compile.

To compile QtWebEngine you have to install some dependencies: https://wiki.qt.io/Building_Qt_5_from_Git