Exit with an error code 1 on bad errors.

    if [ "$ENABLE" = "yes" ]; 

    then

	$TOOLDIR/clean-target.sh $CLEAN_FLAGS $TARGET

	$TIMER $TOOLDIR/build-world.sh $TARGET $OLDLISP $BOOT

	(cd $TARGET/lisp; $MAKE)

	$TOOLDIR/clean-target.sh $CLEAN_FLAGS $TARGET || { echo "Failed: $TOOLDIR/clean-target.sh"; exit 1; }

	$TIMER $TOOLDIR/build-world.sh $TARGET $OLDLISP $BOOT || { echo "Failed: $TOOLDIR/build-world.sh"; exit 1; }

	$MAKE -C $TARGET/lisp || { echo "Failed: $MAKE -C $TARGET/lisp"; exit 1; }

	if [ "$BUILD_WORLD2" = "yes" ];

	then

	    $TOOLDIR/build-world.sh $TARGET $OLDLISP

	fi

	$TOOLDIR/load-world.sh $TARGET "$VERSION"

	if ls $TARGET/lisp/lisp*.core 2>&1 >/dev/null; then

	    true

	else

	    echo "Failed to build $TARGET!"

	    exit 1

	    $TOOLDIR/build-world.sh $TARGET $OLDLISP || { echo "Failed: $TOOLDIR/build-world.sh"; exit 1; }

	fi

	$TOOLDIR/load-world.sh $TARGET "$VERSION" || { echo "Failed: $TOOLDIR/load-world.sh"; exit 1; }

	$TARGET/lisp/lisp -batch -noinit $FPU_MODE < /dev/null || { echo "Failed: $TARGET/lisp/lisp -batch -noinit $FPU_MODE"; exit 1; }

	return 0;

    fi

}