--- ethtool-6.14.orig/netlink/permaddr.c	2022-12-08 13:20:15.000000000 +0100
+++ ethtool-6.14/netlink/permaddr.c	2025-04-09 09:17:36.070462620 +0200
@@ -4,9 +4,11 @@
  * Implementation of "ethtool -P <dev>"
  */
 
+#define _BSD_SOURCE
 #include <errno.h>
 #include <string.h>
 #include <stdio.h>
+#include <unistd.h>
 #include <linux/rtnetlink.h>
 #include <linux/if_link.h>