$MAIL_IN = Linux::Inotify2::IN_MOVED_TO() |
Linux::Inotify2::IN_CREATE();
$ino_cls = 'Linux::Inotify2';
-} elsif (eval { require PublicInbox::KQNotify }) {
+# Perl 5.22+ is needed for fileno(DIRHANDLE) support:
+} elsif ($^V ge v5.22 && eval { require PublicInbox::KQNotify }) {
$MAIL_IN = PublicInbox::KQNotify::MOVED_TO_OR_CREATE();
$ino_cls = 'PublicInbox::KQNotify';
} else {