devel/epoll-shim does not support CLOCK_BOOTTIME, but CLOCK_MONOTONIC
works fine.

Index: notification.c
--- notification.c.orig
+++ notification.c
@@ -898,7 +898,7 @@ notif_reload_timeout(struct notif *notif)
     }
 
     notif->timeout_fd = timerfd_create(
-        CLOCK_BOOTTIME, TFD_CLOEXEC | TFD_NONBLOCK);
+        CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
 
     if (notif->timeout_fd < 0) {
         LOG_ERRNO("failed to create notification timeout timer FD");
