./configure --disable-hardening --with-gcc=/usr/bin/gcc-4.1 --with-g++=/usr/bin/g++-4.1

Checking for environment: Determined build machine: linux.amd64, target machine: linux.amd64, OK.
Checking for kBuild: found, OK.
Checking for gcc: found version 4.1.3, OK.
Checking for as86: found version 0.16.17, OK.
Checking for bcc: found version 0.16.17, OK.
Checking for iasl: found version 20061109, OK.
Checking for xslt: found, OK.
Checking for pthread: found, OK.
Checking for libxml2: found version 2.6.32, OK.
Checking for libxslt: found version 1.1.24, OK.
Checking for libIDL: found version 0.8.10, OK.
Checking for zlib: found version 1.2.3.3, OK.
Checking for libpng: found version 1.2.27, OK.
Checking for SDL: found version 1.2.12, OK.
Checking for X libraries: found, OK.
Checking for Xcursor: found, OK.
Checking for Qt3: found version 3.3.8b, OK.
Checking for Qt3 devtools: found version 3.3.8b, OK.
Checking for Qt4: found version 4.4.3, OK.
Checking for Qt4 devtools: found version 4.4.3, OK.
Checking for python support: found version 2.5.2, OK.
Checking for static stc++ library: found, OK.
Checking for Linux kernel sources: found version 2.6.26, OK.
Checking for ALSA: found version 1.0.16, OK.
Checking for PulseAudio: found version 0.9.10 API version 11, OK.
Checking for libcap library: found, OK.
Checking for compiler.h: compiler.h not found, OK.
Checking for 32-bit support: OK.

Successfully generated '/home/andre/vc/svn/vbox/AutoConfig.kmk' and '/home/andre/vc/svn/vbox/env.sh'.
Source '/home/andre/vc/svn/vbox/env.sh' once before you start to build VBox:

  source /home/andre/vc/svn/vbox/env.sh
  kmk

To compile the kernel module, do:

  cd ./out/linux.amd64/release/bin/src/vboxdrv
  make


  +++ WARNING +++ WARNING +++ WARNING +++ WARNING +++ WARNING +++ WARNING +++
  Hardening is disabled. Please do NOT build packages for distribution with
  disabled hardening!
  +++ WARNING +++ WARNING +++ WARNING +++ WARNING +++ WARNING +++ WARNING +++

Enjoy!