https://git.ruby-lang.org/ruby.git/commit/?id=6d8422659a

From 6d8422659a4c8a51f37433b6e63cc98d8526abe9 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 3 Jul 2021 01:02:46 +0900
Subject: Fix linking bundled zlib

* Prefix "./" to the import library name to expanded when static
  linking exts.

* Copy zlib shared library to the top build directory.
---
 ext/zlib/extconf.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ext/zlib/extconf.rb b/ext/zlib/extconf.rb
index 76cd345..13d0ee2 100644
--- a/ext/zlib/extconf.rb
+++ b/ext/zlib/extconf.rb
@@ -46,7 +46,7 @@ else https://github.com/ruby/ruby/blob/trunk/ext/zlib/extconf.rb#L46
       end
       m = File.read(m)
       zimplib = m[/^IMPLIB[ \t]*=[ \t]*(\S+)/, 1]
-      $LOCAL_LIBS << " " << zimplib
+      ($LOCAL_LIBS << " ./" << zimplib).strip!
       unless $nmake or /^TOP[ \t]/ =~ m
         m.gsub!(/win32\/zlib\.def/, '$(TOP)/\&')
         m.gsub!(/^(\t.*[ \t])(\S+\.rc)/, '\1-I$(<D) $<')
@@ -62,7 +62,7 @@ else https://github.com/ruby/ruby/blob/trunk/ext/zlib/extconf.rb#L62
         "$(TARGET_SO): $(ZIMPLIB)\n",
         "$(ZIMPLIB):\n",
         "#{zmk} $(ZOPTS) $@\n",
-        "install-so: $(topdir)/#{dll}",
+        "install-so static: $(topdir)/#{dll}",
         "$(topdir)/#{dll}: $(ZIMPLIB)\n",
         "\t$(Q) $(COPY) #{dll} $(@D)\n",
         "clean: clean-zsrc\n",
-- 
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