[boost] [test] SIGPOLL not defined on FreeBSD?

If possible I'd like to see a fix for: http://tinyurl.com/3uz5xg Looks like we just need to add FreeBSD to the list of OS's that don't define SIGPOLL at the start of execution_monitor.ipp. The strange thing is, the other FreeBSD tester doesn't fail here... anyone know what the difference is between them? Both define XOPEN_UNIX to be -1 so they're both advertising that they *don't* support this XSI-specific feature. Come to that are these symbols all macros? Could we just check for defined(SIGPOLL) ? Cheers, John.