Index: test/dl/test_import.rb
===================================================================
--- test/dl/test_import.rb	(revision 22794)
+++ test/dl/test_import.rb	(working copy)
@@ -60,7 +60,8 @@
     end
 
     def test_io()
-      if( RUBY_PLATFORM != DL::BUILD_RUBY_PLATFORM )
+      if( RUBY_PLATFORM != DL::BUILD_RUBY_PLATFORM or
+          RUBY_PLATFORM.match(/mswin32/) )
         return
       end
       io_in,io_out = IO.pipe()