From fe1988d4f9f412703793e0194f9a764917889b07 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 7 Sep 2022 00:29:27 +0900
Subject: [PATCH] Use `append_cflags` for other than GCC

---
 ext/rbs_extension/extconf.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/rbs_extension/extconf.rb b/ext/rbs_extension/extconf.rb
index b72e93c19..554a81196 100644
--- a/ext/rbs_extension/extconf.rb
+++ b/ext/rbs_extension/extconf.rb
@@ -1,4 +1,4 @@
 require 'mkmf'
 $INCFLAGS << " -I$(top_srcdir)" if $extmk
-$CFLAGS += " -std=c99 "
+append_cflags ['-std=c99']
 create_makefile 'rbs_extension'