DKMS make.log for virtualbox-guest-4.1.16 for kernel 3.5.0-1-generic (x86_64)
make: Entering directory `/usr/src/linux-headers-3.5.0-1-generic'
  LD      /var/lib/dkms/virtualbox-guest/4.1.16/build/built-in.o
  LD      /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/built-in.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/VBoxGuest-linux.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/VBoxGuest.o
/var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/VBoxGuest.c: In function ‘VBoxGuestCommonIOCtl’:
/var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/VBoxGuest.c:2480:9: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/VBoxGuest2.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/GenericRequest.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/HGCMInternal.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/Init.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/PhysHeap.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/SysHlp.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/VMMDev.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/alloc-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/initterm-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/memobj-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/mpnotification-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/powernotification-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/alloc-r0drv-linux.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/assert-r0drv-linux.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/initterm-r0drv-linux.o
  CC [M]  /var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/memobj-r0drv-linux.o
/var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/memobj-r0drv-linux.c: In function ‘rtR0MemObjLinuxDoMmap’:
/var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/memobj-r0drv-linux.c:1150:9: error: implicit declaration of function ‘do_mmap’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[2]: *** [/var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest/r0drv/linux/memobj-r0drv-linux.o] Error 1
make[1]: *** [/var/lib/dkms/virtualbox-guest/4.1.16/build/vboxguest] Error 2
make: *** [_module_/var/lib/dkms/virtualbox-guest/4.1.16/build] Error 2
make: Leaving directory `/usr/src/linux-headers-3.5.0-1-generic'