[OS X TeX] bibunits package and Texshop

[Sam Cox]

Texshop applies Latex to the source file.  The first  
\begin{bibunit} ... \end{bibunit} results in the file bu1.aux in the  
same folder as the source.  Successive bibunits in the source file  
provide more aux files bu2.aux, bu3.aux, and so on.  Texshop does not  
apply bibtex to these files.

I use Terminal to command: bibtex bu1.aux and similarly for each aux  
file.  Then apply Texshop Latex once more and the bibunits are typeset  
very nicely.

So this works, but it is awkward.  How can I make Texshop do the  
bibtex-ing?

Sam