https://git.ruby-lang.org/ruby.git/commit/?id=17f8fd6568

From 17f8fd656818d62ab18027dc21e463768e1a9b54 Mon Sep 17 00:00:00 2001
From: Carlos Palhares <chjunior@g...>
Date: Mon, 25 Oct 2021 15:50:32 -0300
Subject: Allow custom LicenseRef

---
 lib/rubygems/util/licenses.rb           |  2 ++
 test/rubygems/test_gem_specification.rb | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/lib/rubygems/util/licenses.rb b/lib/rubygems/util/licenses.rb
index 8de5b11ae38..3f4178c6e05 100644
--- a/lib/rubygems/util/licenses.rb
+++ b/lib/rubygems/util/licenses.rb
@@ -5,6 +5,7 @@ class Gem::Licenses https://github.com/ruby/ruby/blob/trunk/lib/rubygems/util/licenses.rb#L5
   extend Gem::Text
 
   NONSTANDARD = 'Nonstandard'.freeze
+  LICENSE_REF = 'LicenseRef-.+'.freeze
 
   # Software Package Data Exchange (SPDX) standard open-source software
   # license identifiers
@@ -523,6 +524,7 @@ class Gem::Licenses https://github.com/ruby/ruby/blob/trunk/lib/rubygems/util/licenses.rb#L524
       \+?
       (?:\s WITH \s #{Regexp.union(EXCEPTION_IDENTIFIERS)})?
       | #{NONSTANDARD}
+      | #{LICENSE_REF}
     )
     \Z
   }ox.freeze
diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index 582813c01dd..bfd0db347e6 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -3066,6 +3066,17 @@ http://spdx.org/licenses or 'Nonstandard' for a nonstandard license. https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_specification.rb#L3066
     WARNING
   end
 
+  def test_validate_license_ref
+    util_setup_validate
+
+    use_ui @ui do
+      @a1.licenses = ['LicenseRef-LICENSE.md']
+      @a1.validate
+    end
+
+    assert_empty @ui.error
+  end
+
   def test_validate_license_values_plus
     util_setup_validate
 
-- 
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