Gentoo's Bugzilla –
Attachment 559592 Details for
Bug 674380app-emulation/virtualbox-modules-5.2.22 with kernel 4.20 - .../work/vboxdrv/r0drv/linux/time-r0drv-linux.c:175:5: error: implicit declaration of function ‘ktime_get_real_ts’; did you mean ‘ktime_get_real_ns’? [-Werror=implicit-function-declaration]