virtualbox-ose-kmod compiles on CURRENT, both 5.0.2 and 5.0.4. virtualbox-ose does not. Neither 5.0.2 nor 5.0.4. 5.0.0 was OK - for me even as everyday use. The problem is with libressl I suppose so. I am still searching for the problem. In case I have any clue I will report it.