1 files changed, 26 insertions, 0 deletions
diff --git a/lib/rubygems/rdoc.rb b/lib/rubygems/rdoc.rb
new file mode 100644
index 0000000000..3524b161b2
--- /dev/null
+++ b/lib/rubygems/rdoc.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require_relative "../rubygems"
+
+begin
+  require "rdoc/rubygems_hook"
+  module Gem
+    ##
+    # Returns whether RDoc defines its own install hooks through a RubyGems
+    # plugin. This and whatever is guarded by it can be removed once no
+    # supported Ruby ships with RDoc older than 6.9.0.
+
+    def self.rdoc_hooks_defined_via_plugin?
+      Gem::Version.new(::RDoc::VERSION) >= Gem::Version.new("6.9.0")
+    end
+
+    if rdoc_hooks_defined_via_plugin?
+      RDoc = ::RDoc::RubyGemsHook
+    else
+      RDoc = ::RDoc::RubygemsHook
+
+      Gem.done_installing(&Gem::RDoc.method(:generation_hook))
+    end
+  end
+rescue LoadError
+end