--- environments/boot.rb.old	2008-10-06 00:43:45.000000000 +0900
+++ environments/boot.rb	2008-10-06 00:43:57.000000000 +0900
@@ -67,7 +67,11 @@
 
     class << self
       def rubygems_version
-        Gem::RubyGemsVersion if defined? Gem::RubyGemsVersion
+        begin
+          Gem::RubyGemsVersion
+        rescue
+          ""
+        end
       end
 
       def gem_version