virtualbox-guest-additions-5.0.18 compilation fails

[Kajan]

virtualbox-guest-additions-5.0.18 fails to compile for Gentoo Linux and kernels 4.4/4.5.1

make -j3 HOSTCC=x86_64-pc-linux-gnu-gcc CROSS_COMPILE=x86_64-pc-linux-gnu- 'LDFLAGS=-m elf_x86_64' KERN_DIR=/lib/modules/4.4.0-pf8/build KERNOUT=/lib/modules/4.4.0-pf8/build all grep: /lib/modules/4.4.0-pf8/build/include/linux/version.h: No such file or directory make KBUILD_VERBOSE=1 -C /lib/modules/4.4.0-pf8/build SUBDIRS=/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm SRCROOT=/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm modules make[1]: Entering directory '/usr/src/linux-4.4_p8-pf'

test -e include/generated/autoconf.h -a -e include/config/auto.conf

( \

echo >&2; \ echo >&2 " ERROR: Kernel configuration is invalid."; \ echo >&2 " include/generated/autoconf.h or include/config/auto.conf are missing.";\ echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo >&2 ; \ /bin/false) mkdir -p /var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm/.tmp_versions ; rm -f /var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm/.tmp_versions/* make -f ./scripts/Makefile.build obj=/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm make[2]: * No rule to make target '/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm/vboxvideo_drm.o', needed by '/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm/vboxvideo.o'. Stop. Makefile:1384: recipe for target '_module_/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm' failed make[1]: * [_module_/var/tmp/portage/x11-drivers/xf86-video-virtualbox-5.0.18/work/vboxvideo_drm] Error 2