https://git.ruby-lang.org/ruby.git/commit/?id=40a1af6151

From 40a1af615197346d423afa38c2854f9faf8ed3f3 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 23 Dec 2021 20:12:45 +0900
Subject: Install ruby/digest.h when from ext/digest

---
 ext/digest/extconf.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ext/digest/extconf.rb b/ext/digest/extconf.rb
index ba2c7b671fb..0e5f08d7947 100644
--- a/ext/digest/extconf.rb
+++ b/ext/digest/extconf.rb
@@ -4,4 +4,8 @@ https://github.com/ruby/ruby/blob/trunk/ext/digest/extconf.rb#L4
 
 require "mkmf"
 
+$INSTALLFILES = {
+  "digest.h" => "$(HDRDIR)"
+} if $extmk
+
 create_makefile("digest")
-- 
cgit v1.2.1


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