https://git.ruby-lang.org/ruby.git/commit/?id=c2a6295ec0

From c2a6295ec04a191c689d22254ac1ad5d665e27ad Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 12 Jul 2020 00:09:04 +0900
Subject: Make the mkmf methods private in the global [Bug #16896]


diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 3abf168..383579e 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2822,7 +2822,12 @@ realclean: distclean https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2822
   end
 end
 
-include MakeMakefile
+# MakeMakefile::Global = #
+m = Module.new {
+  include(MakeMakefile)
+  private(*MakeMakefile.public_instance_methods(false))
+}
+include m
 
 if not $extmk and /\A(extconf|makefile).rb\z/ =~ File.basename($0)
   END {mkmf_failed($0)}
diff --git a/test/mkmf/test_mkmf.rb b/test/mkmf/test_mkmf.rb
new file mode 100644
index 0000000..adb86ec
--- /dev/null
+++ b/test/mkmf/test_mkmf.rb
@@ -0,0 +1,15 @@ https://github.com/ruby/ruby/blob/trunk/test/mkmf/test_mkmf.rb#L1
+# frozen_string_literal: false
+require 'test/unit'
+require 'mkmf'
+
+class TestMkmf < Test::Unit::TestCase
+  class TestGlobal < TestMkmf
+    main = TOPLEVEL_BINDING.receiver
+    MakeMakefile.public_instance_methods(false).each do |m|
+      define_method(:"test_global_#{m}") do
+        assert_respond_to(main, [m, true])
+        assert_not_respond_to(main, [m, false])
+      end
+    end
+  end
+end
-- 
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