bundle install时出现错误怎么办

Fetching gem metadata from http://rubygems.org/.......
Using rake (0.9.2)
Using RedCloth (4.2.8)
Using posix-spawn (0.3.6)
Using albino (1.3.3)
Using blankslate (2.1.2.4)
Using chunky_png (1.2.1)
Using fast-stemmer (1.0.0)
Using classifier (1.3.3)
Using fssm (0.2.7)
Using sass (3.1.5)
Using compass (0.11.5)
Using directory_watcher (1.4.0)
Using ffi (1.0.9)
Using haml (3.1.2)
Using kramdown (0.13.3)
Using liquid (2.2.2)
Using syntax (1.0.0)
Using maruku (0.6.0)
Using jekyll (0.11.0)
Using rubypython (0.5.1)
Using pygments.rb (0.1.3)
Using rack (1.3.2)
Installing rb-fsevent (0.4.3.1) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/Users/danzwl/.rvm/rubies/ruby-1.9.2-p318/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 '/Users/danzwl/.rvm/gems/ruby-1.9.2-p318/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 /Users/danzwl/.rvm/gems/ruby-1.9.2-p318/gems/rb-fsevent-0.4.3.1 for inspection.
Results logged to /Users/danzwl/.rvm/gems/ruby-1.9.2-p318/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.