How do I get Xcode to let me create a Carbon Unit Test Bundle target?

I am having trouble creating a unit test in an Xcode project. The project was created from a template for a 'command-line tool that links against the stdc++ library'.

Apple's instructions for creating a unit test say to set the des开发者_如何学编程ired target type for a C++ program, I should use the New Target Assistant and 'select the Carbon > Unit Test Bundle target'.

But my Xcode is not giving me the option to select Carbon.

I am using Xcode 3.2.6.