From bc947d5644d6311fa23625627613b1465eace777 Mon Sep 17 00:00:00 2001
From: Mike Dalessio <mike.dalessio@gmail.com>
Date: Fri, 6 Aug 2021 10:54:25 -0400
Subject: [PATCH] ext: explicitly allow C90 and C99 features

Related to #2302 and #2303.
---
 ext/nokogiri/extconf.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/nokogiri/extconf.rb b/ext/nokogiri/extconf.rb
index 4278dd6e46..fb36a0ff6e 100644
--- a/ext/nokogiri/extconf.rb
+++ b/ext/nokogiri/extconf.rb
@@ -594,6 +594,9 @@ def do_clean
 append_ldflags(ENV["LDFLAGS"].split) unless ENV["LDFLAGS"].nil?
 $LIBS = concat_flags($LIBS, ENV["LIBS"])
 
+# c99 is old enough to drink
+append_cflags(["-std=c99", "-Wno-declaration-after-statement"])
+
 # always include debugging information
 append_cflags("-g")