alex@opteron~/build% sudo dkms install -m vboxhost -v 4.3.20 -k $(cat /usr/lib/modules/extramodules-3.17.*-grsec/version)  

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area....
make KERNELRELEASE=3.17.6.201412071639-1-grsec -C /usr/lib/modules/3.17.6.201412071639-1-grsec/build M=/var/lib/dkms/vboxhost/4.3.20/build....(bad exit status: 2)
Error! Bad return status for module build on kernel: 3.17.6.201412071639-1-grsec (x86_64)
Consult /var/lib/dkms/vboxhost/4.3.20/build/make.log for more information.

alex@opteron~/build% cat /var/lib/dkms/vboxhost/4.3.20/build/make.log 
DKMS make.log for vboxhost-4.3.20 for kernel 3.17.6.201412071639-1-grsec (x86_64)
Di 9. Dez 17:21:44 CET 2014
make: Entering directory '/usr/lib/modules/3.17.6.201412071639-1-grsec/build'
  LD      /var/lib/dkms/vboxhost/4.3.20/build/built-in.o
  LD      /var/lib/dkms/vboxhost/4.3.20/build/vboxdrv/built-in.o
  CC [M]  /var/lib/dkms/vboxhost/4.3.20/build/vboxdrv/linux/SUPDrv-linux.o
cc1: error: incompatible gcc/plugin versions
cc1: error: fail to initialize plugin ./tools/gcc/constify_plugin.so
cc1: error: incompatible gcc/plugin versions
cc1: error: fail to initialize plugin ./tools/gcc/stackleak_plugin.so
cc1: error: incompatible gcc/plugin versions
cc1: error: fail to initialize plugin ./tools/gcc/colorize_plugin.so
cc1: error: incompatible gcc/plugin versions
cc1: error: fail to initialize plugin ./tools/gcc/kernexec_plugin.so
cc1: error: incompatible gcc/plugin versions
cc1: error: fail to initialize plugin ./tools/gcc/size_overflow_plugin/size_overflow_plugin.so
cc1: error: incompatible gcc/plugin versions
cc1: error: fail to initialize plugin ./tools/gcc/structleak_plugin.so
scripts/Makefile.build:257: recipe for target '/var/lib/dkms/vboxhost/4.3.20/build/vboxdrv/linux/SUPDrv-linux.o' failed
make[2]: *** [/var/lib/dkms/vboxhost/4.3.20/build/vboxdrv/linux/SUPDrv-linux.o] Error 1
scripts/Makefile.build:404: recipe for target '/var/lib/dkms/vboxhost/4.3.20/build/vboxdrv' failed
make[1]: *** [/var/lib/dkms/vboxhost/4.3.20/build/vboxdrv] Error 2
Makefile:1450: recipe for target '_module_/var/lib/dkms/vboxhost/4.3.20/build' failed
make: *** [_module_/var/lib/dkms/vboxhost/4.3.20/build] Error 2
make: Leaving directory '/usr/lib/modules/3.17.6.201412071639-1-grsec/build'
alex@opteron~/build% sudo modprobe vbox
modprobe: FATAL: Module vbox not found.
alex@opteron~/build%