From a11404ad83a29ac176e01d2aec5354f90cb6069d Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Tue, 11 Jun 2019 20:14:45 +0500
Subject: [PATCH] Check for headers

---
 ext/digest/extconf.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ext/digest/extconf.rb b/ext/digest/extconf.rb
index d8b7715..aad3216 100755
--- a/ext/digest/extconf.rb
+++ b/ext/digest/extconf.rb
@@ -20,6 +20,8 @@ end
 cflags '-fvisibility=hidden'
 
 have_header! 'ruby/digest.h'
+have_header! 'stdio.h'
+have_header! 'string.h'
 
 have_func! 'rb_str_set_len'