https://git.ruby-lang.org/ruby.git/commit/?id=21c876d3ca

From 21c876d3ca0980c23f55bea4e1fd0328de3395ae Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@r...>
Date: Sat, 15 Oct 2022 16:27:31 +0900
Subject: merge revision(s) b2491783986084770f6f97552f27b868622730cf:

	Install gems `lib` directory to build path

	---
	 ext/extmk.rb | 19 +++++++++++++++++++
	 1 file changed, 19 insertions(+)
---
 ext/extmk.rb | 19 +++++++++++++++++++
 version.h    |  2 +-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/ext/extmk.rb b/ext/extmk.rb
index 868c1a504d..4d0c415d1b 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -589,6 +589,25 @@ exts.each do |d| https://github.com/ruby/ruby/blob/trunk/ext/extmk.rb#L589
   end
 end
 
+if @gemname
+  src_gemlib = File.join($top_srcdir, ext_prefix, @gemname, "lib")
+  src_gemlib = relative_from(src_gemlib, ([".."]*ext_prefix.count("/")).join("/"))
+  gemlib = "#{@gemname}/lib"
+  if File.directory?(src_gemlib)
+    if File.exist?(gemlib)
+      puts "using #{gemlib}"
+    else
+      begin
+        File.symlink(relative_from(src_gemlib, ".."), gemlib)
+        puts "linked #{gemlib}"
+      rescue NotImplementedError, Errno::EPERM
+        FileUtils.cp_r(src_gemlib, gemlib)
+        puts "copied #{gemlib}"
+      end
+    end
+  end
+end
+
 $top_srcdir = srcdir
 $topdir = "."
 $hdrdir = hdrdir
diff --git a/version.h b/version.h
index a28e5ffaec..a28f055caa 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L11
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 3
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 78
+#define RUBY_PATCHLEVEL 79
 
 #define RUBY_RELEASE_YEAR 2022
 #define RUBY_RELEASE_MONTH 10
-- 
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