make -f scripts/Makefile.build obj=/tmp/vbox.0
  gcc -Wp,-MD,/tmp/vbox.0/linux/.VBoxNetFlt-linux.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.4.7/include -Iinclude  -I/usr/src/kernels/2.6.32-696.16.1.el6.x86_64/include/uapi -I/usr/src/kernels/2.6.32-696.16.1.el6.x86_64/arch/x86/include -Iarch/include/generated -Iinclude -include /usr/src/kernels/2.6.32-696.16.1.el6.x86_64/include/linux/kconfig.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -m64 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -fstack-protector -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_AVX=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-than=2048 -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fno-dwarf2-cfi-asm -fconserve-stack -include /tmp/vbox.0/include/VBox/SUPDrvMangling.h -I/lib/modules/2.6.32-696.16.1.el6.x86_64/build/include -I/tmp/vbox.0/ -I/tmp/vbox.0/include -I/tmp/vbox.0/r0drv/linux -I/tmp/vbox.0/vboxnetflt/ -I/tmp/vbox.0/vboxnetflt/include -I/tmp/vbox.0/vboxnetflt/r0drv/linux -D__KERNEL__ -DMODULE -DRT_OS_LINUX -DIN_RING0 -DIN_RT_R0 -DIN_SUP_R0 -DVBOX -DRT_WITH_VBOX -DVBOX_WITH_HARDENING -DRT_ARCH_AMD64 -DVBOX_WITH_64_BITS_GUESTS  -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(VBoxNetFlt_linux)"  -D"KBUILD_MODNAME=KBUILD_STR(vboxnetflt)" -D"DEBUG_HASH=60" -D"DEBUG_HASH2=11" -c -o /tmp/vbox.0/linux/.tmp_VBoxNetFlt-linux.o /tmp/vbox.0/linux/VBoxNetFlt-linux.c
/tmp/vbox.0/linux/VBoxNetFlt-linux.c: In function ‘vboxNetFltLinuxPacketHandler’:
/tmp/vbox.0/linux/VBoxNetFlt-linux.c:892: error: implicit declaration of function ‘vlan_tx_tag_present’
/tmp/vbox.0/linux/VBoxNetFlt-linux.c:902: error: implicit declaration of function ‘vlan_tx_tag_get’
make[2]: *** [/tmp/vbox.0/linux/VBoxNetFlt-linux.o] Error 1
make[1]: *** [_module_/tmp/vbox.0] Error 2
make: *** [vboxnetflt] Error 2