if [[ ! -f "$SOURCE_CACHE/$SOURCE" || $FORCE_DOWNLOAD ]]; then
  message "${MESSAGE_COLOR}checking out release${DEFAULT_COLOR}" &&
  svn co http://netpbm.svn.sourceforge.net/svnroot/netpbm/release_number/$VERSION \
    "${SOURCE_DIRECTORY/$BUILD_DIRECTORY\//}" &&
  message "${MESSAGE_COLOR}creating source tarball${DEFAULT_COLOR}" &&
  tar -cjf "$SOURCE" "${SOURCE_DIRECTORY/$BUILD_DIRECTORY\//}" &&
  mv "$SOURCE" "$SOURCE_CACHE"
fi
