This is an OpenWrt package feeds.
To use it, add the following line to feeds.conf
which is at the root of OpenWrt source tree.
src-git waller git://github.com/yousong/waller.git
Update the feeds.
./scripts/feeds update waller
Activate packages in feeds
./scripts/feeds install -a -p waller
Select what you want to include in the final image in make menuconfig
.