UPDATE: Works now with OpenWrt "Barrier Breaker" (Bleeding Edge)
Open vSwitch 1.9.0 (OvS) package for OpenWrt
Install this as a feed!
cd $TOPDIR
echo 'src-git openvswitch git://github.com/schuza/openvswitch.git' >> feeds.conf
./scripts/feeds update openvswitch
./scripts/feeds install -a -p openvswitch
make menuconfig
select Network -> openvswitch-switch, openvswitch-brcompat and openvswitch-controller
echo '# CONFIG_KERNEL_BRIDGE is not set' >> .config
Please fork on github and send pull requests.