# Add a vendor_dir for gems at vendor_ruby/gems/<ruby lib version>, to the end 
# of GEM PATHS, so gem will search the vendor directory for gems.
# We can use this directory to install Solaris Ruby modules
# that we want to package as gems.
#
# This is a subset of changes made to Rubygems 2.4.0
# to fix rubygems issue #943 site_ruby/vendor_ruby equivalent for rubygems
# https://github.com/rubygems/rubygems/issues/943
# We do not add the --vendor option to the gem command,
# nor do we change the default gem installation directory.

diff -rupN ruby-1.9.3-p484-orig/lib/rubygems/defaults.rb ruby-1.9.3-p484/lib/rubygems/defaults.rb
--- ruby-1.9.3-p484-orig/lib/rubygems/defaults.rb	2012-04-19 15:43:16.000000000 -0700
+++ ruby-1.9.3-p484/lib/rubygems/defaults.rb	2014-08-05 10:40:08.041798000 -0700
@@ -61,11 +61,11 @@ module Gem
   # Default gem load path
 
   def self.default_path
-    if File.exist? Gem.user_home then
-      [user_dir, default_dir]
-    else
-      [default_dir]
-    end
+    path = []
+    path << user_dir if user_home && File.exist?(user_home)
+    path << default_dir
+    path << vendor_dir if File.directory? vendor_dir
+    path
   end
 
   ##
@@ -121,4 +121,13 @@ module Gem
       'ruby'
     end
   end
+
+  ##
+  # Directory where vendor gems are installed.
+
+  def self.vendor_dir # :nodoc:
+    File.join RbConfig::CONFIG['vendordir'], 'gems',
+              RbConfig::CONFIG['ruby_version']
+  end
+
 end
diff -rupN ruby-1.9.3-p484-orig/test/rubygems/test_gem.rb ruby-1.9.3-p484/test/rubygems/test_gem.rb
--- ruby-1.9.3-p484-orig/test/rubygems/test_gem.rb	2012-04-19 15:43:16.000000000 -0700
+++ ruby-1.9.3-p484/test/rubygems/test_gem.rb	2014-08-05 14:04:49.794776000 -0700
@@ -604,6 +604,45 @@ class TestGem < Gem::TestCase
     Gem::ConfigMap[:ruby_install_name] = orig_RUBY_INSTALL_NAME
   end
 
+  def test_default_path
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG['vendordir'] = File.join @tempdir, 'vendor'
+
+    FileUtils.rm_rf Gem.user_home
+
+    expected = [Gem.default_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_default_path_user_home
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG['vendordir'] = File.join @tempdir, 'vendor'
+
+    expected = [Gem.user_dir, Gem.default_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_default_path_vendor_dir
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG['vendordir'] = File.join @tempdir, 'vendor'
+
+    FileUtils.mkdir_p Gem.vendor_dir
+
+    FileUtils.rm_rf Gem.user_home
+
+    expected = [Gem.default_dir, Gem.vendor_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
   def test_self_default_sources
     assert_equal %w[http://rubygems.org/], Gem.default_sources
   end
@@ -1062,6 +1101,14 @@ class TestGem < Gem::TestCase
     end
   end
 
+  def test_self_vendor_dir
+    expected =
+      File.join RbConfig::CONFIG['vendordir'], 'gems',
+                RbConfig::CONFIG['ruby_version']
+
+    assert_equal expected, Gem.vendor_dir
+  end
+
   def test_load_plugins
     plugin_path = File.join "lib", "rubygems_plugin.rb"