发布于 2016-01-24 08:57:23 | 188 次阅读 | 评论: 1 | 来源: 网友投递
RubyGems Ruby程序包管理器
RubyGems是一个方便而强大的Ruby程序包管理器（ package manager），类似RedHat的RPM.它将一个Ruby应用程序打包到一个gem里，作为一个安装单元。 特点： 能远程安装包 包之间依赖关系的管理 简单可靠的卸载（uninstallation） 查询机制，能查询本地和远程服务器的包信息 能保持一个包的不同版本 基于Web的查看接口，能查看你安装的gem的信息。
这篇文章主要介绍了mac os gem安装json出现error failed的解决办法,系统是mac os Mavericks,失败提示Failed to build gem native extension,需要的朋友可以参考下
升级到最新的mac os Mavericks。装json出现错误：
gem install json -v '1.8.1'
Building native extensions. This could take a while...
ERROR: Error installing json:
ERROR: Failed to build gem native extension.
/usr/local/var/rbenv/versions/2.0.0-p247/bin/ruby extconf.rb
creating Makefile
make "DESTDIR="
compiling generator.c
In file included from /usr/local/var/rbenv/versions/2.0.0-p247/include/ruby-2.0.0/ruby.h:33,
from ../fbuffer/fbuffer.h:5,
from generator.c:1:
/usr/local/var/rbenv/versions/2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:51:21: error: string.h: No such file or directory
/usr/local/var/rbenv/versions/2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:61:21: error: stdint.h: No such file or directory
/usr/local/var/rbenv/versions/2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:64:23: error: inttypes.h: No such file or directory
/usr/local/var/rbenv/versions/2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:68:19: error: stdio.h: No such file or directory
解决办法：
xcode-select --install
需要重新安装Command Line Developer Tools
如果这个办法还是不行，mac下需要安装下apple-gcc42
brew install apple-gcc42
注意brew 0.9.4应该是不带apple-gcc42的源的，可以使用brew doctor检查下是否和Mavericks兼容，这里需要升级
brew update