How to build and install only ntp from base?

[Reko Turja]

As nothing else has changed with the latest 10.3 except ntp I'd love 
to compile only that. I just can't find the right incantation for 
starting the compile -  make <ntpd|build|compile> just tells me that 
<target> is up to date.

What command should I use to compile ntp stuff only - or should I just 
fire up the version from ports?

-Reko