OS X 10.7.3 安装XCode 4.3.1 之后，如果你也安装了命令行：
Preferences > Downloads > Components and click install on Command Line Tools
那再编译什么东西的时候，就有可能收到报错信息，比如我就是在bundle install的时候得到如下信息：
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| Installing rb-fsevent (0.4.3.1) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
creating Makefile
CFLAGS='-isysroot /Developer/SDKs/MacOSX10.7.sdk -mmacosx-version-min=10.7 -mdynamic-no-pic -std=gnu99 -Os -pipe -Wmissing-prototypes -Wreturn-type -Wmissing-braces -Wparentheses -Wswitch -Wunused-function -Wunused-label -Wunused-parameter -Wunused-variable -Wunused-value -Wuninitialized -Wunknown-pragmas -Wshadow -Wfour-char-constants -Wsign-compare -Wnewline-eof -Wconversion -Wshorten-64-to-32 -Wglobal-constructors -pedantic' /usr/bin/clang -isysroot /Developer/SDKs/MacOSX10.7.sdk -mmacosx-version-min=10.7 -mdynamic-no-pic -std=gnu99 -dead_strip -framework CoreServices -o '/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rb-fsevent-0.4.3.1/bin/fsevent_watch' fsevent/fsevent_watch.c
fsevent/fsevent_watch.c:1:10: fatal error: 'stdio.h' file not found
#include <stdio.h>
^
1 error generated.
extconf.rb:59:in `<main>': Compilation of fsevent_watch failed (see README) (RuntimeError)
Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rb-fsevent-0.4.3.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rb-fsevent-0.4.3.1/ext/gem_make.out
An error occured while installing rb-fsevent (0.4.3.1), and Bundler cannot continue.
Make sure that `gem install rb-fsevent -v '0.4.3.1'` succeeds before bundling.
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如果用心看一下，报的是stdio.h file not found.
其实问题出在这个command line tools上，可以用下面这个命令修正：
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| sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/
|