How do I install Open vSwitch?

How do I install Open vSwitch?

How do I install Open vSwitch on raring? I can't find any official Ubuntu
docs on this anywhere.
DevStack seems to do this:
kernel_version=`cat /proc/version | cut -d " " -f3`
apt-get install make fakeroot dkms openvswitch-switch
openvswitch-datapath-dkms linux-headers-$kernel_version
On the other hand, this blog does this:
apt-get install openvswitch-datapath-source openvswitch-common
openvswitch-switch