commit 0fadb48498b3fee85aa02406b2119f9512c04ae3
Author: hsbt <hsbt@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date:   2019-02-05 04:58:46 +0000

    Ignore to add bundler lib direcotry if it is same as rubylibdir.
    
      [Bug #15469][ruby-core:90742]
    
    git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67006 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git lib/bundler/shared_helpers.rb lib/bundler/shared_helpers.rb
index 50214901c5..69f2fde4ef 100644
--- lib/bundler/shared_helpers.rb
+++ lib/bundler/shared_helpers.rb
@@ -340,7 +340,7 @@ def set_rubyopt
 
     def set_rubylib
       rubylib = (ENV["RUBYLIB"] || "").split(File::PATH_SEPARATOR)
-      rubylib.unshift bundler_ruby_lib
+      rubylib.unshift bundler_ruby_lib unless RbConfig::CONFIG["rubylibdir"] == bundler_ruby_lib
       Bundler::SharedHelpers.set_env "RUBYLIB", rubylib.uniq.join(File::PATH_SEPARATOR)
     end
 
diff --git spec/bundler/bundler/shared_helpers_spec.rb spec/bundler/bundler/shared_helpers_spec.rb
index b66c43fd92..fcac37b398 100644
--- spec/bundler/bundler/shared_helpers_spec.rb
+++ spec/bundler/bundler/shared_helpers_spec.rb
@@ -261,6 +261,15 @@
       subject.set_bundle_environment
     end
 
+    it "ignores if bundler_ruby_lib is same as rubylibdir" do
+      allow(Bundler::SharedHelpers).to receive(:bundler_ruby_lib).and_return(RbConfig::CONFIG["rubylibdir"])
+
+      subject.set_bundle_environment
+
+      paths = (ENV["RUBYLIB"]).split(File::PATH_SEPARATOR)
+      expect(paths.count(RbConfig::CONFIG["rubylibdir"])).to eq(0)
+    end
+
     it "exits if bundle path contains the unix-like path separator" do
       if Gem.respond_to?(:path_separator)
         allow(Gem).to receive(:path_separator).and_return(":")