From bbc33f6ec310d98b9100fb883a2b8908ede1b5a8 Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Sat, 15 Jan 2022 22:39:40 +0100
Subject: [PATCH] Netlink: Add another workaround for older kernel headers

Unfortunately, SOL_NETLINK is both recently added and arch-dependent,
so we cannot just define it.
---
 sysdep/linux/netlink.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c
index 27b1a617..ccd62f26 100644
--- a/sysdep/linux/netlink.c
+++ b/sysdep/linux/netlink.c
@@ -164,7 +164,14 @@ nl_open_sock(struct nl_sock *nl)
 static void
 nl_set_strict_dump(struct nl_sock *nl, int strict)
 {
+  /*
+   * Strict checking is not necessary, it improves behavior on newer kernels.
+   * If it is not available (missing SOL_NETLINK compile-time, or ENOPROTOOPT
+   * run-time), we can just ignore it.
+   */
+#ifdef SOL_NETLINK
   setsockopt(nl->fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK, &strict, sizeof(strict));
+#endif
 }
 
 static void