There's still need for having qt5 support out there and the .pro files don't anyway compile with qt6 by now. Adjusting those and the code to build on qt5 didn't even require much adjustments. The hack to get _p.h includes work without private prefix, that used to be there for qmake build, is horrible but at least it's relatively small and affecting only .pro files. The examples had some existing issues building there, missing includes and not entirely disabled protocol editor support. The "almost works" part: builds fine but the metatype side is slightly lacking, resulting also a unit test failure. On qt5 qmailipc.h would need qRegisterMetaTypeStreamOperators() call after qRegisterMetaType() but I'm not eager to add qt version ifdeffing inside a macro, at least now. Hoping to clean up the whole metatype registration first. Change-Id: I6e620175383690ce4e6eb4c841e314ccf031026f Reviewed-by: Damien Caliste <dcaliste@free.fr> Reviewed-by: <matti.viljanen@kapsi.fi> Reviewed-by: Pekka Vuorela <pvuorela@iki.fi>