Ruby on rails 4 无法安装rmagick gem

运行bundle install命令时，出现以下错误：

Errno::EACCES: Permission denied - /Users/delisdeli/.rvm/gems/ruby-2.0.0-p247/gems/rmagick-2.13.2/build_tarball.rake
An error occurred while installing rmagick (2.13.2), and Bundler cannot continue.
Make sure that `gem install rmagick -v '2.13.2'` succeeds before bundling.

然后我运行了“sudogem安装rmagick-v'2.13.2'”，得到了以下结果：

构建本机扩展。这可能需要一段时间

Successfully installed rmagick-2.13.2
Parsing documentation for rmagick-2.13.2
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/RMagick2.bundle, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmagick.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmdraw.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmenum.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmfill.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmilist.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmimage.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rminfo.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmmain.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmmontage.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmpixel.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmstruct.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/RMagick/rmutil.o, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for lib/RMagick2.bundle, skipping
1 gem installed

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但是，当我再次运行bundle安装时，我得到了与第一次尝试相同的输出，有什么建议吗（

也许您需要更新您的rdoc:

gem update rdoc

然后再次尝试安装rmagick

或者如果您不想重新安装

gem rdoc --all --overwrite

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您使用的是什么操作系统？