This distribution of TeXLive aims to save bandwidth and hard disk space
by not including the full texmf tree. But what it does include is capable
enough to satisfy most ports that list texlive as a dependency. In other
words, you should be able to append to /etc/prt-get.aliases the line
and not run into problems. If you later find yourself needing TeXLive
packages that were not included, there is sadly no tlmgr script to
automate the installation from CTAN. You can download them from CTAN
by hand, unpack them into /usr/share/texmf, and then run mktexlsr.
Or create a port that does the same.