https://git.ruby-lang.org/ruby.git/commit/?id=31f4dec637

From 31f4dec6373c15a58899f8b86e35d48a7d813bf6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 14 Feb 2021 11:05:23 +0900
Subject: Refined installation of gemspecs placed other than ext and lib

---
 tool/rbinstall.rb | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index fece0c6..9f6c1c7 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -701,14 +701,15 @@ module RbInstall https://github.com/ruby/ruby/blob/trunk/tool/rbinstall.rb#L701
         when "lib"
           base = @base_dir
           prefix = base.sub(/lib\/.*?\z/, "") + "lib/"
+        else
+          # other/something.gemspec ->
+          #   [other/something.rb, other/something/foo.rb, ...]
+          base = @gemspec.chomp('.gemspec')
+          prefix = @base_dir
         end
 
-        if base
-          Dir.glob("#{base}{.rb,/**/*.rb}").collect do |ruby_source|
-            remove_prefix(prefix, ruby_source)
-          end
-        else
-          [File.basename(@gemspec, '.gemspec') + '.rb']
+        Dir.glob("#{base}{.rb,/**/*.rb}").collect do |ruby_source|
+          remove_prefix(prefix, ruby_source)
         end
       end
 
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