From 30c8f3a80f70c724a3ed57c8dcfd3a5e2ef4b426 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Wed, 1 Jun 2022 12:32:04 +0100
Subject: [PATCH] Fix GH-8674: sockets extension won't build for older Linux
 kernels

In abscence of the needed header, disable the feature altogether.

Closes GH-8677.
---
 configure.ac          | 1 +
 ext/sockets/sockets.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 422bfac9acd..8887c2aea65 100644
--- a/configure.ac
+++ b/configure.ac
@@ -395,6 +395,7 @@ fcntl.h \
 grp.h \
 ieeefp.h \
 langinfo.h \
+linux/sock_diag.h \
 malloc.h \
 poll.h \
 pty.h \
diff --git a/ext/sockets/sockets.c b/ext/sockets/sockets.c
index f5843d5d4d7..fec1e5159c5 100644
--- a/ext/sockets/sockets.c
+++ b/ext/sockets/sockets.c
@@ -55,8 +55,10 @@
 # if HAVE_IF_NAMETOINDEX
 #  include <net/if.h>
 # endif
-# ifdef SO_MEMINFO
+# if defined(HAVE_LINUX_SOCK_DIAG_H)
 #  include <linux/sock_diag.h>
+# else
+#  undef SO_MEMINFO
 # endif
 #endif