From dcce5db8a653a099d3c9a18cb84baa7b989199fd Mon Sep 17 00:00:00 2001
From: Ryan Winograd <ryan@thewinograds.com>
Date: Thu, 20 Aug 2020 19:14:02 -0500
Subject: Fix for older rubies?

---
 test/tc_package.rb | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/test/tc_package.rb b/test/tc_package.rb
index a6e31f88..1574c8b8 100644
--- a/test/tc_package.rb
+++ b/test/tc_package.rb
@@ -165,15 +165,21 @@ class TestPackage < Test::Unit::TestCase
   end
 
   def capture_warnings(&block)
-    original_warn = Kernel.method(:warn)
-    warnings = []
-    Kernel.define_method(:warn){ |string| warnings << string }
-    block.call
-    original_verbose = $VERBOSE
-    $VERBOSE = nil
-    Kernel.define_method(:warn, &original_warn)
-    $VERBOSE = original_verbose
-    warnings
+    # Only capture warnings on versions of ruby that expose `:define_method` as
+    # a public method
+    if Kernel.respond_to?(:define_method)
+      original_warn = Kernel.method(:warn)
+      warnings = []
+      Kernel.define_method(:warn){ |string| warnings << string }
+      block.call
+      original_verbose = $VERBOSE
+      $VERBOSE = nil
+      Kernel.define_method(:warn, &original_warn)
+      $VERBOSE = original_verbose
+      warnings
+    else
+      &block.call
+    end
   end
 
   # See comment for Package#zip_entry_for_part
-- 
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