On Solaris we sometimes need to be setuid root.
Fix when --disable-saidar or --disable-statgrab used on BSD platforms. It seems you can do nested if statements, which is nice. Not sure if you can do combined ones (if foo && bar) or similar, though.
Enable binaries being setgid kmem on FreeBSD. Will set this based on the operating system, but is overridable using a configure flag.
Add all the build stuff for saidar (assuming Pete sticks with that name). The configure script will attempt to find curses, but if it can't will simply disable building of saidar (after giving a warning). Also made the building of saidar, statgrab, and the examples conditional. They're enabled by default, but can be disabled using a configure flag. Whilst I was at it, added a configure flag to disable manpage installation at configure time. I'm not sure how well the curses detection works; we've had at least one report of a problem with it. Testing will be required.
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