有很多人都有类似的问题，我过去在其他机器上也是其中之一，但目前的解决方案似乎都不起作用——我似乎也有与其他有类似问题的人不同的错误：
Building native extensions. This could take a while...
ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
/Users/username/.rvm/rubies/ruby-2.0.0-p353/bin/ruby -r ./siteconf20150412-25981-y7cvt6.rb extconf.rb
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
creating Makefile
make "DESTDIR=" clean
make "DESTDIR="
compiling accessor.cc
clang: warning: argument unused during compilation: '-rdynamic'
In file included from accessor.cc:1:
In file included from ./rr.h:6:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/vector:265:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/__bit_reference:15:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/algorithm:628:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:604:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/iterator:341:10: fatal error: '__debug' file not found
#include <__debug>
^
1 error generated.
make: *** [accessor.o] Error 1
make failed, exit code 2
Gem files will remain installed in /Users/ecnalyr/.rvm/gems/ruby-2.0.0-p353@canopy/gems/therubyracer-0.12.2 for inspection.
Results logged to /Users/ecnalyr/.rvm/gems/ruby-2.0.0-p353@canopy/extensions/x86_64-darwin-14/2.0.0/therubyracer-0.12.2/gem_make.out
运行时：
gem install therubyracer -v '0.12.2'
或简称
bundle install
CCD_ 1包含在我的gemfile中。
我运行的是Yosemite 10.10.3，Ruby 2.0.0-p353，我已经卸载了所有内容，并尝试了gem install libv8 -- --with-system-v8解决方案，但没有找到解决方案。
创建一个临时文件'__debug'为我解决了这个问题。
在终端中运行此命令：
echo'#define _LIBCPP_ASSERT(x，m)((void)0)'|sudo tee-a/Library/Developer/CommandLineTools/usr/include/c++/v1/__debug>/dev/null
我通过重新安装XCode 6.2的命令行工具(而不是XCode 6.3的命令行)解决了这个问题。
堆栈溢出29529455中有更多讨论。