[strongSwan] What compilation flag is needed for systemctl?

[Houman]

Hello,

Today I have compiled the latest StrongSwan 5.9 with the following flags:

./configure --prefix=/usr --sysconfdir=/etc --enable-eap-radius

Everything goes smoothly, but it seems I don't have any services installed.

systemctl restart ipsec
ends up with
Unit ipsec.service could not be found.

Did I have to use the flag --enable-systemd when compiling? And
everything would be in the right place?

I'm on Ubuntu 20.04. Any other advice along the way is much appreciated,

Thank you,
Houman