nginx fails to start - nginx.service not found

[tunist]

i just built the latest mainline nginx from source on fedora 21 (64bit) and
when i run: service nginx start

i see:

Redirecting to /bin/systemctl start  nginx.service
Failed to start nginx.service: Unit nginx.service failed to load: No such
file or directory.

i've searched around online and so far found no-one else reporting the same
issue. 
i think i have fixed this before on another installation in the past.. but
presently i'm not sure what the resolutioin is - can anyone help?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,257457,257457#msg-257457