It was bound to happen sooner or later.
KPresenter still depends on QtRT (aka kotext1) which doesn't work anymore due to it depending on Qt3 internals. And now I reused some widget-classes in the libs, and let those widgets be based on the new kotext (scribe) with the result that kpresenter stopped compiling.

So, I'm disabling kpresenter compilation untill the maintainers start to rework it so it starts to use the flake stuff.