From 42eac4673685fb5f65a5b1fba9fba5e3ee5a8e71 Mon Sep 17 00:00:00 2001
From: eientei95 <einstein95@users.noreply.github.com>
Date: Thu, 5 Mar 2026 08:42:14 +1300
Subject: [PATCH] Fix building on macOS

---
 c/fdpass.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/c/fdpass.c b/c/fdpass.c
index b54df7d..95aa58a 100644
--- a/c/fdpass.c
+++ b/c/fdpass.c
@@ -1,6 +1,10 @@
 /* File descriptor passing based on
  *   https://manned.org/man.c2c6968a/cmsg.3 */
 
+#ifndef MSG_CMSG_CLOEXEC
+#define MSG_CMSG_CLOEXEC 0
+#endif
+
 static ssize_t fufdpass_send(int socket, int fd, const char *buf, size_t buflen) {
     union {
         char buf[CMSG_SPACE(sizeof(int))];