--- ethtool-6.14.orig/netlink/msgbuff.c	2024-10-08 23:24:51.000000000 +0200
+++ ethtool-6.14/netlink/msgbuff.c	2025-04-09 09:16:53.367670289 +0200
@@ -4,10 +4,12 @@
  * Data structures and code for flexible message buffer abstraction.
  */
 
+#define _BSD_SOURCE
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <unistd.h>
 
 #include "../internal.h"
 #include "netlink.h"