xsprite@bigfoot.com writes:

hmm? http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html

"make world" is not a clean entire upgrade, nor does it claim to be. Last I checked, there was no nice way to install security patches to installed software either. The engineering of BSD lags some way behind Debian, sadly.