[XeTeX] Problem with Polyglossia's \aemph command

[Gareth Hughes]

Vafa Khalighi wrote:
>> On the attached minimal example I get the following error when I use the
>> Polyglossia command \aemph to place an overline over text.
>>
>>> * ! Undefined control sequence.
>> *>* \aemph #1->$\overline {\hboxR
>> *>*                               {#1}}$
>> *>* l.6 ܗܢܐ ܛܣܛ: \aemph{ܫܠܡܐ}
>> *>*
>> *>* The control sequence at the end of the top line
>> *>* of your error message was never \def'ed. If you have
>> *>* misspelled it (e.g., `\hobx'), type `I' and the correct
>> *>* spelling (e.g., `I\hbox'). Otherwise just continue,
>> *>* and I'll forget about whatever was undefined.
>> *>*
>> *>* Missing character: There is no ܫ in font cmmi10!
>> *>* Missing character: There is no ܠ in font cmmi10!
>> *>* Missing character: There is no ܡ in font cmmi10!
>> *>* Missing character: There is no ܐ in font cmmi10!
>> *
>> Why can't I get this work?
>>
>> The control sequence \hboxR is undefined which means you have an old
> version of the bidi package. Update your bidi to the latest version
> (v1.1.4c).

Thanks, Vafa, bidi has changed so quickly that I had an old version left
on my local tree that I'd overlooked. As soon as that was deleted,
everything worked fine. Reminder to self: clean up TeX tree more often.

Gareth.