anchor.diff:  with stdenv.lib;
   
   let
  -  version = "4.1.18";
  +
  +  version = "4.1.20";
  +
     forEachModule = action: ''
       for mod in \
         $sourcedir/out/linux.*/release/bin/src/vboxdrv \
  
positive.code:       make -C "$MODULES_BUILD_DIR" "M=$mod" DEPMOD=/do_not_use_depmod ${action}
      done
    '';
  in stdenv.mkDerivation {
    name = "virtualbox-${version}-${kernel.version}";
  
    src = fetchurl {
      url = "http://download.virtualbox.org/virtualbox/${version}/VirtualBox-${version}.tar.bz2";
      sha256 = "e650e4fdc23581b9edc0e5d5705cc596c76796851ebf65ccda0edb8e413fa3b7";
    };
  
    buildInputs =
  
negative.code:         -e 's@MKISOFS --version@MKISOFS -version@' \
          -e 's@PYTHONDIR=.*@PYTHONDIR=${if pythonBindings then python else ""}@' \
          -i configure
      ls kBuild/bin/linux.x86/k* tools/linux.x86/bin/* | xargs -n 1 patchelf --set-interpreter ${stdenv.glibc}/lib/ld-linux.so.2
      ls kBuild/bin/linux.amd64/k* tools/linux.amd64/bin/* | xargs -n 1 patchelf --set-interpreter ${stdenv.glibc}/lib/ld-linux-x86-64.so.2
      find . -type f | xargs sed 's/depmod -a/true/' -i
      export USER=nix
      set +x
  