Ports Tree, Installing
Before you can install any ports in FreeBSD you will need to install the ports collection. The ports tree is placed in /usr/ports/ and consists of the makefiles and information required to porperly download and install all of the FreeBSD ports.
The easiest way to install the ports tree is to use sysinstall
> su (enter root password) > sysinstall (or /stand/sysinstall for versions < 5.2) -> Select Configure -> Select Distributions -> Select ports -> go to Exit -> Select installation media, (CDROM, FTP, ...) -> go to Exit -> Exit sysinstall (Press X)
See also: Update the ports tree