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I'm trying to install portmaster on FreeBSD but I get an error about the port format:

root@freebsd:/usr/ports/ports-mgmt/portmaster # make install clean
===>  portmaster-3.17.8_1 pkg(8) must be version 1.6.0 or greater, but you
have 1.4.12. You must upgrade the ports-mgmt/pkg port first.
*** Error code 1
Stop.
make: stopped in /usr/ports/ports-mgmt/portmaster
How can I upgrade the port file to the latest version?