if [ "$WESNOTH_DEVEL" == "y" ]; then
   default_pre_build
else
   if [[ $WESNOTH_XDELTA == y && ${SOURCE/xdelta/} != $SOURCE ]]; then
     # override SOURCE, so the new tarball gets checked, not the xdelta
     SOURCE=$SPELL-$VERSION.tar.bz2
   fi &&
   default_pre_build
fi
