哎，折腾appfog中。。出现caldecott安装问题！

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gem install caldecott
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Users/spencer/.rvm/gems/ruby-2.0.0-p0 directory.
~ spencer$ caldecott
-bash: caldecott: command not found
~ spencer$ af tunnel
To use `af tunnel', you must first install Caldecott:

gem install caldecott

Note that you'll need a C compiler. If you're on OS X, Xcode
will provide one. If you're on Windows, try DevKit.

This manual step will be removed in the future.

Error: Caldecott is not installed.

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caldecott spencer install