Programmer - Tools to find included headers which are unused?

Programmer Question

I know PC-Lint can tell you about headers which are included but not used. Are there any other tools that can do this, preferably on linux?

We have a large codebase that through the last 15 years has seen plenty of functionality move around, but rarely do the leftover #include directives get removed when functionality moves from one implementation file to another, leaving us with a pretty good mess by this point. I can obviously do the painstaking thing of removing all the #include directives and letting the compiler tell me which ones to reinclude, but I'd rather solve the problem in reverse - find the unused ones - rather than rebuilding a list of used ones.