[XeTeX] about xdvipdfmx in Mac OSX

[Dalyoung]

Dear all,

I updated ConTeXt and run XeTeX+ConTeXt using the command "texmfstart  
texexec --xetex file.tex",
then it produce file.xdv not file.pdf. Hence I have to do one more  
step "xdv2pdf file.xdv".
But there is white blank spaces for all the figures. Is it related  
with xdvipdfmx?

I have read that xdvipdfmx is the default driver for XeTeX in Linux.
Is it also true for Mac OSX? But, there is no xdvipdfmx in my Mac  
system(G5, OSX 10.4.6).
If XeTeX+ConTeXt need xdvipdfmx, how to make it in Mac OS X?

Thank you for reading.

Best Regards,

Dalyoung