You can use TTF, but the way to add TTF is a little tricky (at least
in my experience). First add TTF to X11's TTF directory (if there is
one), execute mkfontscale, and copy font.scale to font.dir. If there
is not an TTF directory, you can create one, then modify xinitrc or
~/.xinitrc and add one line like: xset +fp /usr/X11R6/lib/X11/fonts/
TTF/