下载了 shopqi 项目，走到执行 bundle install 走到 therubyracer 就失败了， 我是 lion 10.7.3 Bundler version 1.1.0

错误提示片段如下：

Installing therubyracer (0.9.4) with native extensions Unfortunately, a fatal error has occurred. Please report this error to the Bundler issue tracker at https://github.com/carlhuda/bundler/issues so that we can fix it. Thanks!
/Users/Summic/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:552:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

        /Users/Summic/.rvm/rubies/ruby-1.9.3-p125/bin/ruby extconf.rb 
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
creating Makefile

make
compiling rr.cpp
clang: warning: argument unused during compilation: '-rdynamic'
clang: warning: argument unused during compilation: '-ggdb'
rr.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
rr.cpp:151:44: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    return String::New(RSTRING_PTR(value), RSTRING_LEN(value));
                                           ^~~~~~~~~~~~~~~~~~
/Users/Summic/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/ruby.h:674:6: note: expanded from macro 'RSTRING_LEN'
     RSTRING_EMBED_LEN(str) : \
     ^