'port definitions old' even after git pull

[Jan Stary]

This is macports from git, running on 10.6.8.
Both base and the port definitions are from git,
living in /opt/mports/macports-base
and /opt/mports/macports-ports, respectively.

My sources.conf says

  file:///opt/mports/macports-ports/ [default]

as per https://guide.macports.org/#installing.macports.git
to use my clone as the only source.

Yet port(1) always says

  Warning: port definitions are more than two weeks old, consider updating
  them by running 'port selfupdate'.

even after I have just run git pull on the ports.
Am I missing something obvious?

	Jan