anchor.diff:        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";
  +    sha256 = "b132dbc5c6e9ed77aba737ec35b488ac152aa362c3ad49d466897bc410324aeb";
     };
   
     buildInputs =
  
positive.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
  
negative.code: with stdenv.lib;
  
  let
  
    version = "4.1.20";
  
    forEachModule = action: ''
      for mod in \
        $sourcedir/out/linux.*/release/bin/src/vboxdrv \
  