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-rw-r--r--lib/PublicInbox/DirIdle.pm3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/PublicInbox/DirIdle.pm b/lib/PublicInbox/DirIdle.pm
index daa2212b..458285e2 100644
--- a/lib/PublicInbox/DirIdle.pm
+++ b/lib/PublicInbox/DirIdle.pm
@@ -13,7 +13,8 @@ if ($^O eq 'linux' && eval { require Linux::Inotify2; 1 }) {
         $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 {