XeLaTeX on OS X doesn't recognise some diacritics signs

Question

I've just moved to OS X 10.8.2 from Ubuntu. I have TeX installed as I guess from tug.org, but I'm not sure since it wasn't me who installed it. All my files created in Ubuntu compiles exept one problem: the diacritic mark \b{h} is not found by XeLaTeX (while it works in LaTeX), in log file there is a warning:

Missing character: There is no ẖ in font [lmroman10-regular]:mapping=tex-text !

UPDATE

Here is part of the document:

documentclass[openany]{book}

\usepackage{setspace}
\usepackage{fontspec}
\usepackage{polyglossia}
\usepackage{indentfirst}
\setlength{\parindent}{0in}

\setmainlanguage{polish}
\setotherlanguage[locale=mashriq]{arabic}
\setromanfont[Mapping=tex-text]{Latin Modern Mono}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.3,Mapping=arabicdigits]{Scheherazade}

\begin{document}

\b{h}ur\=u\v g

 \end{document}

All other diacritics are found.

I've changed font I was using under Ubuntu (Linux Libertine O) to Latin Modern, but it didn't help the diacritics.

Thanks.

Answer 1

The Latin Modern fonts don't have the U+1E96 character ('LATIN SMALL LETTER H WITH LINE BELOW'), which is the meaning of the warning you get. Other fonts, such as Linux Libertine, have it.

If you are stuck with a font that hasn't that character, a way out can be adapting an answer of mine to the problem at hand.

\documentclass{article}

\usepackage{fontspec}
\usepackage{newunicodechar}

\UndeclareUTFcomposite[\UTFencname]{x1E96}{\b}{h}
\makeatletter
\DeclareRobustCommand{\b}[1]
   {\hmode@bgroup\o@lign{\relax#1\crcr\hidewidth\ltx@sh@ft{-3ex}%
     \vbox to.2ex{\hbox{\char"AF}\vss}\hidewidth}\egroup}
\makeatother

\newunicodechar{ẖ}{\b{h}}

\begin{document}

\b{h}ur\=u\v g

ẖurūǧ

\end{document}

This shows also how you can use direct input for the characters with diacritics (provided you save your file as UTF-8).

---

Note. Stating \setromanfont[Mapping=tex-text]{Latin Modern Mono} is not good under three respects

1. \setromanfont is deprecated and \setmainfont should be used
2. Mapping=tex-text is now better expressed as Ligatures=TeX
3. Latin Modern Mono is a monospaced font, which is not good for the main text