I am trying to run a qt application I built. I am getting warning about missing qpa plugins. Then I installed qt6-qpa-plugins via apt get. Then used

export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt6/plugins

When running the gui application I get

qt.core.plugin.factoryloader: Ignoring QPA plugin due to mismatching Qt versions 395264 393728

When I try to build qtwayland v6.8.1 locally. I get an error

src/plugins/hardwareintegration/compositor/hardwarelayer/vsp2/main.cpp:12:1: error: Parse error at "IID"
make: *** [Makefile:26592: main.moc] Error 1

Any idea how to approach this?