gem安装nmatrix失败

Question

当我输入命令gem install matrix时。它会报告一个“致命”错误，即stdio.h文件丢失！为什么？以及如何修复它？谢谢!错误报告如下：

Building native extensions.  This could take a while...

ERROR:  Error installing nmatrix:
ERROR: Failed to build gem native extension.

/Users/apple/.rvm/rubies/ruby-2.2.2/bin/ruby -r ./siteconf20151212-6597-v5fw6g.rb extconf.rb

/Users/apple/.rvm/rubies/ruby-2.2.2/include/ruby-2.2.0/ruby/defines.h:26:19: fatal error: stdio.h: No such file or directory

checking for apparent GNU g++ binary with C++0x/C++11 support... 4.9
using C++ standard... c++11
g++ reports version... gcc
creating nmatrix_config.h
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling nmatrix.cpp
In file included from /Users/apple/.rvm/rubies/ruby-2.2.2/include/ruby-2.2.0/ruby/ruby.h:29:0,
                 from /Users/apple/.rvm/rubies/ruby-2.2.2/include/ruby-2.2.0/ruby.h:33,
                 from nmatrix.cpp:34:
/Users/apple/.rvm/rubies/ruby-2.2.2/include/ruby-2.2.0/ruby/defines.h:26:19: fatal error: stdio.h: No such file or directory
 #include <stdio.h>
                   ^
compilation terminated.
make: *** [nmatrix.o] Error 1

make failed, exit code 2

Answer 1

这个错误类似于一堆其他问题，对他们来说，这似乎解决了它。

xcode-select --install