TEX_DEFAULT:
A knob to choose teTeX or TeXLive. One can specify in /etc/make.conf.
USE_TEX:
A knob for port developers. Valid keywords are listed in
bsd.tex.mk.
automatically converts LaTeX math code enclosed in \[...\] into inline images.
Clicking on the image or moving the cursor over the image reveals the markup
again.
WWW: http://www.reitwiessner.de/programs/tomboy-latex.html