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只是似乎无法在我的 macbook Air 上安装 Rails。

按照http://ruby.railstutorial.org/上的教程开始 安装 RVM、Homebrew、Ruby 2.0.0、GCC 编译器和 XCode 命令行工具这些都安装得很好。

只是无法通过安装 Rails 的最后一步。在过去的 2 天里，我阅读了每篇博文和安装指南。仍然没有运气。这是我最后的选择，所以我希望有人能看到我遗漏的内容。

这是我在运行 gem install rails 时收到的错误消息：

Building native extensions.  This could take a while...
ERROR:  Error installing rails:
    ERROR: Failed to build gem native extension.

    /Users/nick/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/Users/nick/.rvm/rubies/ruby-2.0.0-p247/bin/ruby
    --with-atomic_reference-dir
    --without-atomic_reference-dir
    --with-atomic_reference-include
    --without-atomic_reference-include=${atomic_reference-dir}/include
    --with-atomic_reference-lib
    --without-atomic_reference-lib=${atomic_reference-dir}/
/Users/nick/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/mkmf.rb:434:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /Users/nick/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/mkmf.rb:519:in `try_link0'
    from /Users/nick/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/mkmf.rb:817:in `try_run'
    from extconf.rb:26:in `<main>'


Gem files will remain installed in /Users/nick/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/atomic-1.1.14 for inspection.
Results logged to /Users/nick/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/atomic-1.1.14/ext/gem_make.out

这是错误消息中提到的 mkmf.log 的内容：

" -o conftest -I/Users/nick/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/x86_64-darwin12.3.0 -I/Users/nick/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward -I/Users/nick/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -O3 -I/Users/mpapis/.sm/pkg/active/include -fPIC -pipe conftest.c  -L. -L/Users/nick/.rvm/rubies/ruby-2.0.0-p247/lib -L.  -L/Users/mpapis/.sm/pkg/active/lib -L/usr/lib -fPIC -Bstatic -fstack-protector   -arch x86_64   -lruby-static  -lpthread -ldl -lobjc "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

任何想法，将不胜感激。

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