Clone OpenWrt
git clone https://git.openwrt.org/openwrt/openwrt.git
Change into OpenWrt folder by
cd openwrt
Copy feeds.conf.default to feeds.conf
cp feeds.conf.default feeds.conf
after that add to feeds.conf
src-git falter https://github.com/Freifunk-Spalter/packages.git
Then do
./scripts/feeds update -a
./scripts/feeds install -a
Select packages using
make menuconfig