Added the following patch from the [email protected] mailing list:

http://lists.openidenabled.com/pipermail/dev/attachments/20091101/9a551153/attachment.bin

Original Message:
zblut at cerego.co.jp zblut at cerego.co.jp
Sun Nov 1 23:18:16 PST 2009
darcs patch: This is a quick hack to try and load the ruby-hmac imp...
  "* This is a quick hack to try and load the ruby-hmac implementations of hmac-sha1 and sha2,
  because if a user has ruby-oauth installed on the same system with ruby-openid, the user
  will get really annoying warning messages about hmac CONSTANTS being overwritten.
  A diff of the code shows that these hmac implementations are the same code, so this should be
  safe.

  silence_hmac_warnings_with_oauth_gem"

Patch format wasn't correct, seemed to be from a darcs output, but wasn't in the repo.  Applied the patch manually.

Author: Lilli

lib/openid/cryptutil.rb

@@ -4,8 +4,15 @@
 begin
   require "digest/hmac"
 rescue LoadError
-  require "hmac/sha1"
-  require "hmac/sha2"
+  begin
+    # Try loading the ruby-hmac files if they exist
+    require "hmac-sha1"
+    require "hmac-sha2"
+  rescue LoadError
+    # Nothing exists use included hmac files
+    require "hmac/sha1"
+    require "hmac/sha2"
+  end
 end
 
 module OpenID