Possible Duplicate:
TeX accents do not seem to work with fontspec and xe/lua/latex
Very frequently I need to write letters with dots below (like ḥ or ṭ) for transliteration. It's ok when the font I'm using comes with the character, but I can't use that character with other fonts.
It used to work with xelatex and xunicode package, I'd just use \d{t}, for example, but that doesn't seem to be the case anymore, it just works if the font has that particular character.
Is there a way to "force" a dot below a letter in any font?
Here is the basic preamble I've been using:
\documentclass{article}
\usepackage{fontspec}
\usepackage{xunicode}
\setmainfont{Minion Pro}

Missing character: There is no ọ in font Minion Pro Display/ICU:script=latn;language=DFLT;– egreg Dec 13 '11 at 12:16