From 321ed86e93a34833bd869c6bc3f52d84b8ecce35 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 19 Jun 2024 19:31:18 +0900
Subject: [PATCH] [rubygems/rubygems] Do not set previously unset value

https://github.com/rubygems/rubygems/commit/0148cce153
---
 test/rubygems/test_gem_installer.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/rubygems/test_gem_installer.rb b/test/rubygems/test_gem_installer.rb
index 61609a26c9..52498cdd6d 100644
--- a/test/rubygems/test_gem_installer.rb
+++ b/test/rubygems/test_gem_installer.rb
@@ -2577,6 +2577,7 @@ end
 
     yield
   ensure
-    RbConfig::CONFIG["LIBRUBY_RELATIVE"] = orig_libruby_relative
+    # RbConfig::CONFIG values are strings only, there should not be a nil.
+    RbConfig::CONFIG["LIBRUBY_RELATIVE"] = orig_libruby_relative if orig_libruby_relative
   end
 end