[OS X TeX] xelatexmk and fontspec

[Sam Cox]

With the five lines beginning with \usepackage{fontspec} commented, my  
file (attached) processes fine.
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When they are not commented, the process ends without making pdf  
output.  It gives this message:

Latexmk: Found bibliography file(s) [/Users/samcox/Library/texmf/ 
bibtex/bib/unified.bib]
Latexmk: Found bibliography file(s) [/Users/samcox/Library/texmf/ 
bibtex/bib/unified.bib]
Latexmk: Did not finish processing file: 'pdflatex' did not make 'cv- 
test.pdf'
Latexmk: Use the -f option to force complete processing.
Latexmk: Errors, so I did not complete making targets


If I replace the first line with

%!TEX TS-program = pdflatexmk

and the font lines not commented, it does not complete processing,  
giving this error:

(/usr/local/texlive/2008/texmf-dist/tex/xelatex/fontspec/fontspec.sty
(/usr/local/texlive/2008/texmf-dist/tex/generic/ifxetex/ifxetex.sty)
!
  ********************************************
  * XeTeX is required to compile this document.
  * Sorry!
  ********************************************.
\RequireXeTeX ...********************************}
                                                   \endgroup \fi
l.18 \RequireXeTeX

?
Process aborted



I have looked at the archives and documentation for fontspec but still  
cannot make this work.   Any ideas?  I am using TeXLive-2008 and  
TeXShop.

Sam