From e468eaa39659640db15c60e48c0a0e85e4ca1a84 Mon Sep 17 00:00:00 2001
From: itchyny <itchyny@cybozu.co.jp>
Date: Tue, 27 Jun 2023 07:25:55 +0900
Subject: Fix glibc warning about _BSD_SOURCE and redefined _GNU_SOURCE (fix
 #1978) (#2631)

---
 src/builtin.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/builtin.c b/src/builtin.c
index 649dec3a..9b2d9a23 100644
--- a/src/builtin.c
+++ b/src/builtin.c
@@ -1,5 +1,6 @@
-#define _BSD_SOURCE
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #ifndef __sun__
 # define _XOPEN_SOURCE
 # define _XOPEN_SOURCE_EXTENDED 1
-- 
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