[strongSwan] systemd swanctl possible error

[Ygor Regados]

I am trying to use the new strongswan systemd service on Arch Linux. It
is working after a manual start but when I try to "enable"
strongswan-swanctl, it returns the following error:

> # systemctl enable strongswan-swanctl
> The unit files have no [Install] section. They are not meant to be enabled
> using systemctl.
> Possible reasons for having this kind of units are:
> 1) A unit may be statically enabled by being symlinked from another unit's
>    .wants/ or .requires/ directory.
> 2) A unit's purpose may be to act as a helper for some other unit which has
>    a requirement dependency on it.
> 3) A unit may be started when needed via activation (socket, path, timer,
>    D-Bus, udev, scripted systemctl call, ...).

Is this expected (i.e. it should start automatically by other means)?
Using strongSwan 5.2.1.

Thanks,
Ygor