From 22a121383f73fa7739f324021b6ad0ba6ed3cdb3 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Sun, 11 Sep 2022 00:44:14 +0200
Subject: Allow for overriding feature test macros

---
 liberty.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/liberty.c b/liberty.c
index a3b8d27..4d27127 100644
--- a/liberty.c
+++ b/liberty.c
@@ -16,8 +16,13 @@
  *
  */
 
-#define _POSIX_C_SOURCE 199309L
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200112L
+#endif
+
+#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE 600
+#endif
 
 #include <stdio.h>
 #include <stddef.h>
-- 
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