mk_source_dir  $SOURCE_DIRECTORY                        &&
cd  $SOURCE_DIRECTORY                                   &&
unpack_file                                             &&
cd  linux-$VERSION                                      &&
if [[ ! -f $CONFIG_CACHE/user-mode-linux.config ]]
then
  cp $SPELL_DIRECTORY/user-mode-linux.config $CONFIG_CACHE/user-mode-linux.config
fi                                                      &&
cp $CONFIG_CACHE/user-mode-linux.config ./.config       &&
yes '' | make ARCH=um oldconfig

.