Wrong qt plugin dir on debian

[Simon Frei]

I compile kmymoney on debian testing and with the result of make
install, the qt5 libraries get installed to
/usr/lib/x86_64-linux-gnu/plugins
and they are not found when starting kmymoney (i.e. it cannot read the
database). Moving that directory to
/usr/lib/x86_64-linux-gnu/qt5/plugins
makes everything work. I search through kmymoneys cmake code, but
couldn't find out where this path is defined/looked up. Any ideas what
this might be about and/or how to fix it?