It's probably from the upgrade to RubyGems 1.8.x. You shouldn't need any copies 
of rubygems-update around after updating, so you can just:
> gem uninstall rubygems-update
and you won't see that particular warning anymore.

If you still see it for other gems, the outdated methods will need to be 
removed from their gemspecs and new versions released.

Adam Stegman

On May 13, 2011, at 10:12 AM, Mohammed Niyas wrote:

> NOTE: Gem::Specification#default_executable= is deprecated with no
> replacement. It will be removed on or after 2011-10-01.
> Gem::Specification#default_executable= called from
> /usr/local/lib/ruby/gems/1.9.1/specifications/rubygems-update-1.7.2.gemspec:11.
> 
> Please anyone explain..
> 
> Thanks and Regards.....
> 
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