大佬教程收集整理的这篇文章主要介绍了ruby – 宝石在更新到OS X 10.10优胜美地测试版后不工作，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
运行这个(或任何其他gem安装/卸载)：
sudo gem install mysql2psql
它总是会给我以下错误：
/Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:159:in `synchronize': ERROR: Failed to build gem native extension. (Gem::Ext::BuildError)
ERROR: Failed to build gem native extension.
deadlock; recursive locking
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/mysql-2.9.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-14/2.0.0/mysql-2.9.1/gem_make.out
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/mysql-2.9.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-14/2.0.0/mysql-2.9.1/gem_make.out
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:159:in `build_extension'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:198:in `block in build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:195:in `each'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:195:in `build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:1436:in `block in build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/user_interaction.rb:45:in `use_ui'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:1434:in `build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/stub_specification.rb:60:in `build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/basic_specification.rb:56:in `contains_requirable_file?'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:925:in `block in find_inactive_by_path'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:924:in `each'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:924:in `find'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:924:in `find_inactive_by_path'
from /Library/Ruby/Site/2.0.0/rubygems.rb:185:in `try_activate'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:132:in `rescue in require'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'
from /Library/Ruby/Site/2.0.0/rubygems.rb:601:in `load_yaml'
from /Library/Ruby/Site/2.0.0/rubygems/config_file.rb:328:in `load_file'
from /Library/Ruby/Site/2.0.0/rubygems/config_file.rb:197:in `initialize'
from /Library/Ruby/Site/2.0.0/rubygems.rb:289:in `new'
from /Library/Ruby/Site/2.0.0/rubygems.rb:289:in `configuration'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:63:in `run'
from /Library/Ruby/Site/2.0.0/rubygems/ext/ext_conf_builder.rb:38:in `block in build'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tempfile.rb:324:in `open'
from /Library/Ruby/Site/2.0.0/rubygems/ext/ext_conf_builder.rb:17:in `build'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:161:in `block (2 levels) in build_extension'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:160:in `chdir'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:160:in `block in build_extension'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:159:in `synchronize'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:159:in `build_extension'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:198:in `block in build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:195:in `each'
from /Library/Ruby/Site/2.0.0/rubygems/ext/builder.rb:195:in `build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:1436:in `block in build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/user_interaction.rb:45:in `use_ui'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:1434:in `build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/stub_specification.rb:60:in `build_extensions'
from /Library/Ruby/Site/2.0.0/rubygems/basic_specification.rb:56:in `contains_requirable_file?'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:925:in `block in find_inactive_by_path'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:924:in `each'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:924:in `find'
from /Library/Ruby/Site/2.0.0/rubygems/specification.rb:924:in `find_inactive_by_path'
from /Library/Ruby/Site/2.0.0/rubygems.rb:185:in `try_activate'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:132:in `rescue in require'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'
from /Library/Ruby/Site/2.0.0/rubygems.rb:601:in `load_yaml'
from /Library/Ruby/Site/2.0.0/rubygems/config_file.rb:328:in `load_file'
from /Library/Ruby/Site/2.0.0/rubygems/config_file.rb:197:in `initialize'
from /Library/Ruby/Site/2.0.0/rubygems/gem_runner.rb:74:in `new'
from /Library/Ruby/Site/2.0.0/rubygems/gem_runner.rb:74:in `do_configuration'
from /Library/Ruby/Site/2.0.0/rubygems/gem_runner.rb:39:in `run'
from /usr/bin/gem:21:in `<main>'
也许有人可以帮忙！ Xcode 6 beta安装包括命令行工具.
先谢谢一堆！
sudo rm -rf /Library/Ruby/Gems/*; sudo gem update --system
(如上所述
here)
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