How to link to Boost for iPhone using XCode
OK so I worked it out. I will leave aside my feelings of intellectual inadequacy. For those who may have the same problem, here are step-by-step instructions.
First, you must have compiled boost on iPhone using the code and instructions from the boostoniphone project.
Navigate within the "boostoniphone" folder to the "framework" folder.Click on the "boost.framework" folder in that location, and drag it into the main xcode window, in the left hand side column, into the "frameworks" group (along with all the other frameworks, i.e. Foundation.framework, UIKit.framework, etc.)
That's it.If you added any build settings while trying to get this to work, remove them.
Note to self: next time, study the example project and copy its settings.