QtWebEngineQuick of Qt6 on Linux

[amirmasoudabdol]

I’m trying to setup a GitHub Action for building my project, and I need to install Qt. I have tried the brew formula and it works fine but I see that QtWebEngineQuick is not installed and my CMake config fails with this:

-- Could NOT find Qt6WebEngineQuick (missing: Qt6WebEngineQuick_DIR)
CMake Error at Desktop/CMakeLists.txt:27 (find_package):
  Found package configuration file:
    /home/linuxbrew/.linuxbrew/lib/cmake/Qt6/Qt6Config.cmake

  but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT FOUND. 
  Failed to find Qt component "WebEngineQuick".

  Expected Config file at does NOT exist

I'm setting up the dependencies, and installing Qt like this:

      - name: Dependencies
        run: |
          sudo apt-get -y install build-essential mercurial gfortran-9 gfortran-10 flex bison r-base cmake libarchive-dev zlibc libzstd-dev mesa-utils libglu1-mesa-dev freeglut3-dev mesa-common-dev libglew-dev libglfw3-dev libglm-dev libao-dev libmpg123-dev
          brew install qt

Am I missing something, or is this not just possible because of unavailability of WebEngineQuick dependencies, e.g., node.js and python2, on Ubuntu 20.04?

[SMillerDev]

Why not just install QT with apt?

[amirmasoudabdol]

apt doesn't offer the Qt6, otherwise I would have loved to do it using apt!

[cho-m]

Is Python 2 a mandatory requirement to build QtWebEngineQuick?

If so, then the answer is it isn't possible via homebrew-core formula since we intentionally don't allow Python 2 as dependency for Linux bottles. It is temporarily allowed on macOS due to system Python 2, but it will no longer be possible once macOS 12.3 is released (Homebrew/homebrew-core#93940).

In this case, you would need to find a 3rd-party option, which can be a modified version of Homebrew formula in Tap to use an externally maintained python@2 formula dependency. Or, see if anyone maintains an external repo via APT (though quick search didn't show anything).

---

If Python 2 isn't a hard requirement, then further triage is needed as we do use python@3.9 and node to build qt formula.

[cho-m]

From quick glance into qtwebengine, I think Homebrew cannot build this until qt 6.3 is released.

I see Python 2 lookup replaced with Python 3 with update to Chromium version: https://code.qt.io/cgit/qt/qtwebengine.git/commit/?id=61de0e721f672e854551a8938d2d42ba946398cf

[amirmasoudabdol]

Is Python 2 a mandatory requirement to build QtWebEngineQuick?

That seems to be the case, and therefore, we can only wait I guess at this point! :\