There are certain third-party tainted kernel modules (such as old Cisco VPN clients) that can interfere with inotify operation, preventing us from being able to detect changes to the resolv.conf file.

We should add an option {{{try_inotify}}} that defaults to True on systems where inotify is available. If the {{{/etc}}} filesystem supports inotify at runtime, it will use inotify. If the user sets {{{try_inotify}}} to false explicitly, this option will force it to use the fallback mechanism of polling the file every 5 seconds.

If configure did not detect support for inotify, this option will have no effect, as inotify will never be used.