[Qtwebengine] Fail to build on Ubuntu

[Benjamin TERRIER]

Hi,

I am trying to build Qt WebEngine v6.2.4 on Ubuntu 20.04, but it fails with
the following error:

[2826/29879] ACTION
> //third_party/catapult/tracing:generate_about_tracing(/home/benjamin/devel/build/qtwebengine/src/core/target_toolchain:target)
> FAILED: gen/content/browser/tracing/about_tracing.js
> gen/content/browser/tracing/about_tracing.html
> /usr/bin/python2.7
> ../../../../../../qt/qtwebengine/src/3rdparty/chromium/third_party/catapult/tracing/bin/generate_about_tracing_contents
> --outdir gen/content/browser/tracing
> Traceback (most recent call last):
>   File
> "../../../../../../qt/qtwebengine/src/3rdparty/chromium/third_party/catapult/tracing/bin/generate_about_tracing_contents",
> line 14, in <module>
>     sys.exit(generate_about_tracing_contents.Main(sys.argv[1:]))
>   File
> "/home/benjamin/devel/qt/qtwebengine/src/3rdparty/chromium/third_party/catapult/tracing/tracing_build/generate_about_tracing_contents.py",
> line 60, in Main
>     minify=not args.no_min)
>   File
> "/home/benjamin/devel/qt/qtwebengine/src/3rdparty/chromium/third_party/catapult/common/py_vulcanize/py_vulcanize/generate.py",
> line 142, in GenerateJSToFile
>     minified_js = _MinifyJS(js)
>   File
> "/home/benjamin/devel/qt/qtwebengine/src/3rdparty/chromium/third_party/catapult/common/py_vulcanize/py_vulcanize/generate.py",
> line 92, in _MinifyJS
>     stderr=subprocess.PIPE)
>   File "/usr/lib/python2.7/subprocess.py", line 394, in __init__
>     errread, errwrite)
>   File "/usr/lib/python2.7/subprocess.py", line 1047, in _execute_child
>     raise child_exception
> OSError: [Errno 2] No such file or directory


I've done the same build with Debian 11 (same source directory, same config
command line) and it finished without error, so I am a bit confused.

Any idea how to solve this, or where to start looking?

Regards

Benjamin
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