Gem::Specification
在Mac OSX 10.6.7上运行gem update --system后，可能会出现：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 /Library/Ruby/Gems/1.8/specifications/acts_as_ferret-0.5.1.gemspec:10.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 /Library/Ruby/Gems/1.8/specifications/aws-s3-0.6.2.gemspec:10.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 /Library/Ruby/Gems/1.8/specifications/bundler-1.0.0.gemspec:10.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 /Library/Ruby/Gems/1.8/specifications/erubis-2.6.6.gemspec:10.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 /Library/Ruby/Gems/1.8/specifications/json-1.4.6.gemspec:10. 解决办法：
sudo gem pristine --all
转自：http://www.phpmercenary.com/2011/05/note-gemspecificationdefault_executable-is-deprecated-with-no-replacement/
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