--- src/util.c.orig	2022-06-30 09:17:04.000000000 -0500
+++ src/util.c	2022-07-01 06:00:26.000000000 -0500
@@ -35,6 +35,8 @@
 #define _XOPEN_SOURCE     700
 #define _GNU_SOURCE
 
+#define _DARWIN_C_SOURCE 200809L
+
 #include <arpa/inet.h>
 #include <ctype.h>
 #include <errno.h>