Hi,
I have been working on and off for the last month to get MuseScore 4.4.x
packaged for Guix. I have come so far as to have the project build but not
run. The program gets partially through its startup procedure but fails
with a QML related error:

23:10:58.058 | WARN  | main_thread     | Qt              |
> QQmlApplicationEngine failed to load component
> 23:10:58.112 | ERROR | main_thread     | GuiApp::perform | error:
> qrc:/qml/platform/linux/Main.qml: module "QtQml.WorkerScript" is not
> installed
> 23:10:58.112 | WARN  | main_thread     | Qt              |
> qrc:/qml/platform/linux/Main.qml: module "QtQml.WorkerScript" is not
> installed
> 23:10:58.112 | WARN  | main_thread     | Qt              |
> QObject::connect(QQuickWindow, QApplication): invalid nullptr parameter
> 23:10:58.113 | INFO  | main_thread     | AudioOutputDeviceController::init
> | Available output devices changed, checking connection...
> 23:10:58.116 | ERROR | main_thread     | GuiApp::perform | failed Qml load


If anyone has a pointer such are gracefully received. Right now it's time
for me to give up for today.

Unrelated: The largest change that's needed for this build to work is to
change build system for HarfBuzz to meson. This because the makefile based
build does not produce correct CMake-files for HarfBuzz. The attached
work-in-progress-patch creates a separate package for HarfBuzz for
convenience while developing the patch - but the build system should
probably be changed for the real HarfBuzz package in the real patch.

Cheers!