[qttools] Cannot configure with LLVM19 and 20 installed

+ /home/moheim/qt/qt6/qtbase/configure -top-level -submodules qttools -- -DBUILD_qttools=ON -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19 -DLLVM_INSTALL_DIR=/usr/lib/llvm-19
'/usr/bin/cmake' '-DQT_BUILD_SUBMODULES=qttools' '-DBUILD_qttools=ON' '-DCMAKE_C_COMPILER=clang-19' '-DCMAKE_CXX_COMPILER=clang++-19' '-DLLVM_INSTALL_DIR=/usr/lib/llvm-19' '-DQT_INTERNAL_CALLED_FROM_CONFIGURE:BOOL=TRUE' '-G' 'Ninja' '/home/moheim/qt/qt6'
-- Checking dependencies of submodule 'qtbase'
-- Checking dependencies of submodule 'qtactiveqt'
-- Checking dependencies of submodule 'qtimageformats'
-- Checking dependencies of submodule 'qtlanguageserver'
-- Checking dependencies of submodule 'qtshadertools'
-- Checking dependencies of submodule 'qtsvg'
-- Checking dependencies of submodule 'qtdeclarative'
-- Checking dependencies of submodule 'qttools'
-- Configuring submodule 'qtbase'
-- [QtBase] CMAKE_BUILD_TYPE was already explicitly set to: 'Release'
-- Configuring submodule 'qtactiveqt'
Condition "WIN32" is not met, enabling documentation build only.
-- Configuring submodule 'qtimageformats'
-- Configuring submodule 'qtlanguageserver'
-- Configuring submodule 'qtshadertools'
-- Configuring submodule 'qtsvg'
-- Configuring submodule 'qtdeclarative'
-- Configuring submodule 'qttools'
CMake Warning at qttools/cmake/FindWrapLibClang.cmake:72 (find_package):
  Could not find a configuration file for package "Clang" that exactly
  matches requested version "20.1.0".

  The following configuration files were considered but not accepted:

    /usr/lib/llvm-19/lib/cmake/clang/ClangConfig.cmake, version: 19.1.1
    /usr/lib/cmake/clang-18/ClangConfig.cmake, version: 18.1.8
    /usr/lib/cmake/clang-14/ClangConfig.cmake, version: unknown
    /usr/lib/cmake/clang-19/ClangConfig.cmake, version: 19.1.1
    /usr/lib/cmake/clang-13/ClangConfig.cmake, version: unknown
    /usr/lib/cmake/clang-15/ClangConfig.cmake, version: unknown
    /lib/cmake/clang-18/ClangConfig.cmake, version: 18.1.8
    /lib/cmake/clang-14/ClangConfig.cmake, version: unknown
    /lib/cmake/clang-19/ClangConfig.cmake, version: 19.1.1
    /lib/cmake/clang-13/ClangConfig.cmake, version: unknown
    /lib/cmake/clang-15/ClangConfig.cmake, version: unknown

Call Stack (most recent call first):
  qtbase/cmake/QtFindPackageHelpers.cmake:141 (find_package)
  qttools/configure.cmake:6 (qt_find_package)
  qtbase/cmake/QtFeature.cmake:1030 (include)
  qttools/src/CMakeLists.txt:18 (qt_feature_evaluate_features)


CMake Warning at qttools/cmake/FindWrapLibClang.cmake:72 (find_package):
  Could not find a configuration file for package "Clang" that exactly
  matches requested version "20.1.0".

  The following configuration files were considered but not accepted:

    /usr/lib/llvm-19/lib/cmake/clang/ClangConfig.cmake, version: 19.1.1
    /usr/lib/cmake/clang-18/ClangConfig.cmake, version: 18.1.8
    /usr/lib/cmake/clang-14/ClangConfig.cmake, version: unknown
    /usr/lib/cmake/clang-19/ClangConfig.cmake, version: 19.1.1
    /usr/lib/cmake/clang-13/ClangConfig.cmake, version: unknown
    /usr/lib/cmake/clang-15/ClangConfig.cmake, version: unknown
    /lib/cmake/clang-18/ClangConfig.cmake, version: 18.1.8
    /lib/cmake/clang-14/ClangConfig.cmake, version: unknown
    /lib/cmake/clang-19/ClangConfig.cmake, version: 19.1.1
    /lib/cmake/clang-13/ClangConfig.cmake, version: unknown
    /lib/cmake/clang-15/ClangConfig.cmake, version: unknown

Call Stack (most recent call first):
  qtbase/cmake/QtFindPackageHelpers.cmake:141 (find_package)
  qttools/configure.cmake:6 (qt_find_package)
  qtbase/cmake/QtModuleHelpers.cmake:703 (include)
  qttools/src/global/CMakeLists.txt:8 (qt_internal_add_module)



-- Configuration summary has been written to /home/moheim/qt/build-qttools/config.summary

WARNING:
QDoc will not be compiled, probably because clang's C and C++ libraries could not be located.
This means that you cannot build the Qt documentation. You may need to set the CMake variables
CMAKE_PREFIX_PATH or LLVM_INSTALL_DIR to the location of your llvm installation.
Other than clang's libraries, you may need to install another package, such as clang itself, to
provide the ClangConfig.cmake file needed to detect your libraries. Once this file is in place,
the configure script may be able to detect your system-installed libraries without further
environment variables.

NOTE: You WILL also need to set the FEATURE_clang CMake variable to ON to re-try finding the
dependencies.

On macOS, you can use Homebrew's llvm package.
Run `brew install llvm` and then configure with

 `configure LLVM_INSTALL_DIR=/opt/homebrew/opt/llvm FEATURE_clang=ON` for macOS arm64
or
 `configure LLVM_INSTALL_DIR=/usr/local/opt/llvm FEATURE_clang_ON` for macOS x86_64.

On Linux, you can try installing the clang package from your distribution's package manager.
On Debian / Ubuntu run `sudo apt install libclang-dev`.
On Fedora / RHEL run `sudo dnf install clang-devel`.
On ArchLinux run `sudo pacman -S clang llvm`.

Alternatively, you can use the prebuilt binaries hosted by Qt.
These let you link LLVM/Clang libraries statically, but only support Release builds on Windows.
https://download.qt.io/development_releases/prebuilt/libclang/qt/

After installing, reconfigure with

 `/qt_src/configure FEATURE_clang=ON` for a top-level build that includes the qttools repo
or
 `/qt_build/qt-configure-module /path/to/qttools FEATURE_clang=ON` for a per-submodule build


-- Configuring done (12.2s)
-- Generating done (1.8s)
-- Build files have been written to: /home/moheim/qt/build-qttools