[boost] Forcing rebuild of tests when headers change

I've changed the headers of boost.thread several times recently, and it has become apparent that those testers doing incremental runs are not picking up the changes, and are thus not rebuilding the tests. This is especially problematic when the library files change too --- the libraries are rebuilt, but the tests are not, which leads to linker errors or crashes depending on the nature of the mismatch. Is there a way to make boost build aware of the headers belonging to a specific library, so changes to those headers will force recompilation of anything dependent on that library? Thanks, Anthony