install gems with extensions on RG 2.0pre2.2

patch: @jeremy
specs: me

lib/bundler/source/path/installer.rb

@@ -10,6 +10,7 @@ def initialize(spec, options = {})
           @wrappers          = options[:wrappers] || true
           @env_shebang       = options[:env_shebang] || true
           @format_executable = options[:format_executable] || false
+          @build_args        = options[:build_args] || Bundler.rubygems.build_args
         end
 
         def generate_bin

spec/install/git_spec.rb

@@ -51,7 +51,7 @@
       end
     end
 
-    it "setups executables" do
+    it "sets up git gem executables on the path" do
       pending_jruby_shebang_fix
       bundle "exec foobar"
       expect(out).to eq("1.0")
@@ -808,4 +808,34 @@
       expect(out).to include("failed for foo-1.0")
     end
   end
+
+  context "with an extension" do
+    it "installs the extension" do
+      build_git "foo" do |s|
+        s.add_dependency "rake"
+        s.extensions << "Rakefile"
+        s.write "Rakefile", <<-RUBY
+          task :default do
+            path = File.expand_path("../lib", __FILE__)
+            FileUtils.mkdir_p(path)
+            File.open("\#{path}/foo.rb", "w") do |f|
+              f.puts "FOO = 'YES'"
+            end
+          end
+        RUBY
+      end
+
+      install_gemfile <<-G
+        source "file://#{gem_repo1}"
+        gem "foo", :git => "#{lib_path('foo-1.0')}"
+      G
+
+      run <<-R
+        require 'foo'
+        puts FOO
+      R
+      expect(out).to eq("YES")
+    end
+  end
+
 end