4.1.42 is not building it's modules on Core6 for dCore-wheezy. I remember having issues in the past with building modules for dCore-wheezy with the newer 3.16.6 kernel, so I won't spend more time with it.
However, Virtualbox 5.0.10 is building it's modules nicely for the update in dCore-wily, aim to upload it soon.